Free & Open Source

Aider

✓

Open-source terminal pair programmer with git-native workflows

Aider is an open-source AI pair programming tool that runs in the terminal and keeps your workflow inside git. It can automatically create commits, apply diff-based edits across multiple files, and map your repository for large projects. Aider is model-flexible: you can use current OpenAI, Anthropic, Google, DeepSeek, and local model stacks through direct APIs, OpenRouter, Ollama, or compatible endpoints.

• ●Automatic git commits with descriptive messages
• ●Diff-based, multi-file editing directly in the terminal
• ●Works with current frontier model families (OpenAI, Anthropic, Gemini) plus DeepSeek and local models

Amazon Q Developer

✓

Agentic AWS-aware coding assistant with IDE, CLI, and console coverage

Amazon Q Developer (formerly CodeWhisperer) is AWS’s generative AI assistant for coding, application upgrades, and cloud operations. It provides agentic chat in IDEs, the AWS Console, chat apps, and the CLI (upgradeable to the Kiro CLI) to accelerate coding, run secure code scans and tests, and transform Java/.NET applications with guided upgrade workflows. The perpetual Free tier includes 50 agentic requests and 1,000 lines of code transformations per month; Pro is $19/user/month with higher limits, pooled upgrade quotas, admin controls, and IP indemnity.

• ●Agentic chat and coding in IDEs with inline suggestions and repository-aware context
• ●CLI command completions and agentic workflows (Q Developer CLI users can upgrade to Kiro CLI)
• ●AWS Console assistant for troubleshooting, cost optimization, and architecture guidance

AutoGen

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Open-source multi-agent framework (Python/.NET) with AgentChat and Studio

AutoGen is Microsoft's open-source framework for building agentic applications with your own model API keys. The current stable release (python v0.7.5, Sep 30 2025) ships a layered architecture: Core for event-driven message passing across Python and .NET runtimes, AgentChat for common multi-agent patterns, Extensions for model/tool connectors (OpenAI and Azure OpenAI, Anthropic, Gemini via OpenAI-compatible endpoints, and local models via Ollama), plus AutoGen Studio for no-code multi-agent prototyping and AutoGen Bench for evaluation. It's MIT-licensed and maintained in the open on GitHub.

• ●Layered Core, AgentChat, and Extensions architecture with event-driven agents
• ●AutoGen Studio for visual multi-agent workflow building
• ●AutoGen Bench and Magentic-One reference agents for evaluation and examples

Bito AI

AI code completions, reviews, and chat for VS Code and JetBrains

Bito is an AI-powered coding assistant that provides code completions, agentic code reviews, and chat for developers. It offers intelligent autocompletions with multiple suggestions, codebase-aware reviews in pull requests and IDEs, and a versatile chat interface. Bito supports over 35 languages including Python, JavaScript, C++, Go, and SQL. It includes comment-driven coding where you describe functionality in comments and Bito generates code options. Bito is available as an extension for VS Code and JetBrains IDEs, with end-to-end encryption, no code storage or model training, and SOC 2 Type II certification.

• ●AI code completions with multiple suggestions
• ●Agentic code reviews in PRs and IDEs
• ●Codebase-aware review with custom rules

Blackbox AI

AI code completion and autonomous coding agent for developers

Blackbox AI is an AI coding assistant that provides code completion, generation, and autonomous agent capabilities. It integrates with VS Code and offers code autocomplete across many languages, code generation, explanation, and commit message suggestions. Blackbox can run as a coding agent that builds, tests, and deploys code, with support for browser, VS Code, CLI, IDE, and desktop interfaces. It provides access to many AI models for chat, code, and related tasks.

• ●Code completion and autocomplete across many languages
• ●Code generation, explanation, and improvement suggestions
• ●Commit message generation

Bolt.new

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AI web and app builder with tokens-based plans, hosting, and databases

Bolt.new is an AI-powered builder from StackBlitz that generates and edits production-grade web/apps in the browser. It provides hosted previews, databases, auth, custom domains, and team controls. Pricing is token-based: Free (300K/day, 1M/month), Pro (starts at 10M/month), Teams ($30/member/month), and Enterprise with SSO/audit/security. Built on WebContainers with live previews and deploys via Bolt Cloud.

• ●Generate and iteratively edit apps/sites with AI in the browser
• ●WebContainers-based workspace with live preview and package management
• ●Hosting, databases, auth, SEO, and custom domains via Bolt Cloud

Cline

Open-source autonomous AI coding agent for VS Code with plan-and-act workflows

Cline is an open-source AI coding agent that runs as a VS Code extension. Originally released as Claude Dev, it reads codebases, creates and edits files, runs terminal commands, and can automate browser interactions with user approval at each step. Cline supports plan mode for analysis without changes and act mode for executing edits. It works with any LLM provider including Anthropic Claude, OpenAI, Google Gemini, AWS Bedrock, Azure OpenAI, and local models via Ollama or LM Studio, with deep MCP support for custom tools.

• ●Plan mode: analyze requests and propose approaches without modifying files
• ●Act mode: execute changes with approval to prevent unintended rewrites
• ●Reads codebase, edits files, runs terminal commands, automates browser

CodeRabbit

AI-powered code review for GitHub and GitLab pull requests

CodeRabbit is an AI-driven code review application for GitHub and GitLab that automates pull request reviews with contextual feedback. It triggers reviews when PRs are opened, provides line-by-line analysis with actionable suggestions, and generates PR summaries. CodeRabbit offers an interactive chat to query code and get advice, validates changes against linked issues, and can auto-generate docstrings and unit tests. It supports all programming languages and integrates with GitHub, GitLab, Bitbucket, and Azure DevOps.

• ●Automated PR reviews when PRs are opened
• ●Line-by-line analysis with actionable suggestions
• ●PR summaries for understanding change intent

Continue

✓

Open-source, model-agnostic AI coding assistant for VS Code and JetBrains

Continue is an open-source coding assistant that lets developers use their own models (OpenAI, Anthropic, local via Ollama/LM Studio) with custom prompts and workflows. It runs as a VS Code and JetBrains extension, supports chat and completions, and can be self-hosted or run fully local for privacy.

• ●Model-agnostic with BYO keys
• ●Open-source and customizable prompts/commands
• ●Local/offline support via Ollama or LM Studio

CrewAI

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MIT-licensed agents, crews, and flows framework with optional control plane

CrewAI is an MIT-licensed Python framework for multi-agent automations. The 1.6.1 release (Nov 29 2025) ships Crews for autonomous collaboration and Flows for event-driven orchestration with guardrails, memory, knowledge, and observability hooks. It runs with your own model/API keys (OpenAI/Azure OpenAI, Anthropic, OpenAI-compatible providers like Groq, or local via Ollama/LM Studio) and offers an optional Crew Control Plane for hosted/on-prem tracing, triggers, and RBAC.

• ●Crews for autonomous agent collaboration and Flows for event-driven orchestration
• ●Guardrails, memory, knowledge, and structured outputs for production automations
• ●CLI/SDK with uv-based project scaffolding and tool integrations

Cursor

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The AI-native code editor with $1B+ ARR, 25+ models, and background agents on dedicated VMs

Cursor is an AI-powered code editor built on a fork of VS Code by Anysphere, valued at $29.3B with over $1B in annual recurring revenue and 1M+ daily active users. It integrates AI directly into editing workflows with Supermaven-powered Tab autocomplete (sub-100ms latency), Composer for multi-file editing, and Agent mode for autonomous tasks. Cursor supports 25+ AI models including Claude Opus 4.5, Sonnet 4.6, GPT-5.2, and Gemini 2.5 Pro, and runs up to 20 concurrent background agents on dedicated AWS VMs for parallel development workflows.

• ●Supermaven-powered Tab autocomplete with sub-100ms latency and multi-line predictions
• ●Agent Mode (Cmd+L): conversational AI that reads, writes, and modifies files across your project
• ●Composer (Cmd+I): multi-file generation and editing from natural language

DeepSeek Coder

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Open-source MoE coding model (V2) with 128K context

DeepSeek Coder V2 is an open Mixture-of-Experts coding model (16B Lite and 236B) with a 128K context window and support for 338 programming languages. Weights are published on Hugging Face for self-hosting; code is MIT-licensed and the model weights use the DeepSeek Model License. Hosted inference is available through the DeepSeek API using OpenAI-compatible endpoints.

• ●DeepSeek-Coder-V2 Mixture-of-Experts models (236B total / 21B active, plus 16B Lite / 2.4B active)
• ●128K context window with fill-in-the-middle support
• ●Supports 338 programming languages

GitHub Copilot

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AI pair programmer built into GitHub and popular IDEs

GitHub Copilot delivers inline completions, chat, and pull request assistance with GitHub-native context across VS Code, Visual Studio, JetBrains IDEs, Neovim, GitHub.com, and Copilot CLI. Current plans include a free tier plus premium-request allowances on paid plans, with access to newer model families based on subscription level.

• ●Inline code completion in supported IDEs
• ●Copilot Chat with codebase and repository context
• ●Pull request summaries and code review assistance

Gemini Code Assist

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Google's AI coding assistant with Agent Mode, 1M token context, MCP support, and free individual tier

Gemini Code Assist is Google's AI coding assistant for VS Code and JetBrains IDEs. It features Agent Mode (launched July 2025) for autonomous multi-step coding within the IDE, 1M token context for understanding entire codebases, and MCP support for connecting to external tools. The free individual tier offers 6,000 code requests and 240 chat requests per day. Individual Pro pricing is $19.99/month, with Enterprise plans at $19/user/month through Google Cloud for governance, customization, and IP indemnification.

• ●Agent Mode (July 2025): autonomous multi-step coding within the IDE
• ●1M token context window for understanding entire codebases
• ●MCP support for connecting to external tools and data sources

Goose

Open-source terminal-first AI agent from Block for autonomous coding

Goose is an open-source AI agent from Block that works as a terminal-first coding assistant. Rather than autocomplete, it executes tasks autonomously in your terminal: running commands, editing files, making multi-file changes, reading error logs, and self-correcting when commands fail. Goose supports multiple providers including OpenAI, Anthropic, Google, Meta, and Ollama, and integrates with Claude Code or Google Gemini CLI subscriptions. It includes MCP support for tools, APIs, databases, and browser automation, with session management for conversation context and state.

• ●Terminal-first: executes commands, edits files, runs tests
• ●Self-corrects when commands fail
• ●Multi-file editing and git commands

JetBrains AI Assistant

Integrated AI coding assistance for JetBrains IDEs and VS Code

JetBrains AI Assistant brings AI-powered code completion, chat, and editing to JetBrains IDEs and, in preview, to VS Code. It supports cloud models like GPT-4.1, Claude 3.7 Sonnet, and Gemini 2.5 Pro, with improved RAG-based context and multi-file editing from chat. A free tier includes unlimited completion and local model support with limited cloud quotas. JetBrains AI Assistant also supports the Agent Client Protocol for bringing your own AI agents, and offers image attachments in chat for supported models.

• ●Code completion with multiline support for Java and C++
• ●AI chat with codebase context and image attachments
• ●Multi-file editing directly from chat

LangChain

✓

Open-source framework for LLM apps with LangSmith observability

LangChain is an open-source framework for building LLM apps with composable chains, agents, tools, and RAG. It supports Python and TypeScript, integrates with major model providers and vector stores, and pairs with LangSmith for tracing, monitoring, and evals.

• ●Composable chains for multi-step workflows
• ●Agent framework with tool use
• ●RAG (Retrieval Augmented Generation)

LangGraph

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Graph-based framework for controllable, stateful AI agents

LangGraph is an open-source framework in the LangChain ecosystem for building stateful, multi-step agents with controllable graphs (single, multi-agent, hierarchical flows). It supports human-in-the-loop interrupts, streaming, memory, and tool use, and can be deployed via LangGraph Platform or self-hosted OSS.

• ●Graph-based agent architecture (single, multi-agent, hierarchical)
• ●Stateful execution with memory and persistence
• ●Branching and conditional control flows

Mintlify

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Docs platform with AI assist, portals, and SSO for teams

Mintlify is a hosted documentation platform with AI-assisted writing, search, analytics, and developer portal features. It supports custom domains, SSO on higher tiers, and integrations with GitHub/GitLab. Pricing details are not fully public; plans are listed as Free/Pro/Enterprise with AI assistant and writing agent on paid tiers.

• ●Hosted docs with AI-assisted writing
• ●Search and analytics for docs
• ●Custom domains and branding

Ollama

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Run AI models locally with Docker-like simplicity, 200+ model families, and full API compatibility

Ollama is the open-source standard for running AI models locally. With 155K+ GitHub stars and 2.5M weekly downloads, it provides Docker-like commands (pull, run, create) to manage 200+ model families on your own hardware. Ollama offers full OpenAI and Anthropic API compatibility as a drop-in replacement, GPU acceleration across Apple Metal, NVIDIA CUDA, AMD ROCm, and Vulkan, plus features like vision support, structured JSON outputs, tool calling, embeddings, and experimental image generation. Ollama Turbo ($20/month) adds optional cloud inference for users who want both local and hosted options.

• ●200+ model families: Qwen2.5-Coder, DeepSeek-Coder V2, Codestral, Qwen3-Coder, GPT-OSS, Llama 4, and more
• ●Docker-like CLI: ollama pull, ollama run, ollama create with Modelfile customization
• ●OpenAI and Anthropic API compatibility as a drop-in endpoint replacement

OpenAI Codex

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Cloud coding agent with 1M+ developers, Desktop App, and parallel sandboxed environments

OpenAI Codex is a cloud-based software engineering agent platform used by over 1M developers. Launched in May 2025 with a Desktop App added in February 2026, Codex spins up parallel sandboxed environments, reads your codebase, writes code, runs tests, and submits PRs autonomously. Powered by dedicated models including GPT-5.2-Codex and GPT-5.3-Codex optimized for code generation, it supports multi-file editing, automated testing, PR generation, and parallel task execution. The platform includes a macOS Desktop App with Xcode integration for Apple developers.

• ●1M+ developers using Codex for software engineering
• ●Parallel sandboxed environments: reads codebase, writes code, runs tests, submits PRs
• ●Desktop App for macOS with Xcode integration (February 2026)

OpenCode

Open-source AI coding agent for the terminal with multi-provider support

OpenCode is an open-source AI coding agent built for the terminal. It helps developers write code via a terminal interface, desktop app, or IDE extension. OpenCode supports many LLM providers including Claude, GPT, Gemini, and local models, with GitHub Copilot and ChatGPT Plus login options. It features LSP integration, multi-session agents, and a privacy-first approach that does not store code or context. The CLI supports run commands for single tasks, a headless API server, and MCP management.

• ●Terminal interface and desktop app (beta)
• ●opencode run for single-task execution
• ●opencode serve for headless API

Perplexity

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AI answer engine with real-time citations, Deep Research, and the Sonar API

Perplexity is an AI-powered answer engine that delivers real-time web search results with source citations on every response. Processing 780M monthly queries for 30M active users, it offers Quick and Pro search modes, Focus modes (Academic, Writing, Math, Video), and Deep Research for multi-step autonomous synthesis across dozens of sources. The Sonar API provides developer access to search-augmented AI at up to 1,200 tokens/second via a Cerebras partnership. Perplexity also ships Comet, a free AI-native Chromium browser, and Perplexity Computer, a full autonomous computer agent launched February 26, 2026.

• ●Real-time web search with source citations on every answer
• ●Deep Research for autonomous multi-step synthesis across dozens of sources
• ●Focus modes: Academic, Writing, Math, and Video

Pieces for Developers

✓

Local-first snippet manager with AI assist and cross-tool integrations

Pieces for Developers captures code snippets, screenshots, and workflow context locally, making them searchable and reusable with AI-assisted enrichment. It offers desktop apps plus IDE/browser integrations, with optional cloud LLMs and team features on paid plans.

• ●Local-first snippet capture and search
• ●Screenshot/OCR capture
• ●Workflow context (Live Context)

Firebase Studio (formerly Project IDX)

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Firebase Studio cloud IDE with Gemini-assisted development

Project IDX has been folded into Firebase Studio, an agentic browser IDE with Gemini in Firebase for coding, debugging, testing, and refactoring. The preview is no-cost with 3 workspaces per user; Google Developer Program members get 10 (Standard) or 30 (Premium). App Prototyping and Code Assist agents, built-in previews/emulators, Git imports, and App Hosting deployments are included; some Firebase services bill separately once linked to Cloud Billing.

• ●Agentic browser workspace with Gemini in Firebase chat and code actions
• ●App Prototyping agent to scaffold apps from text, sketches, or templates
• ●Import from GitHub/GitLab/Bitbucket or local; customize via Nix

Replit

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AI-first cloud IDE with Replit Agent, Core/Teams credits, and one-click app hosting

Replit is a browser-based IDE with Replit Agent for autonomous edits, chat, and code generation. Core and Teams plans bundle monthly credits for compute, databases, and AI. Build and deploy full-stack apps with connectors, auth, storage, and security scanning straight from the workspace—no setup required.

• ●Browser-based workspace with app hosting, DB, auth, storage, and security scanner
• ●Replit Agent for autonomous edits, chat, tests, and deploys
• ●One-click publish with bundled credits for compute and bandwidth

Roo Code

Open-source AI-powered autonomous coding agent for VS Code

Roo Code, formerly Roo Cline, is an open-source AI-powered autonomous coding agent that integrates into VS Code. It acts like a virtual dev team in your editor, with natural language communication, multi-file editing via diff-based changes, terminal command execution, and automated browser actions. Roo Code offers specialized modes for coding, debugging, and architecture, and is model-agnostic with support for any OpenAI-compatible or custom API. It requires user approval before executing automation. The extension includes a marketplace for community MCPs and Modes.

• ●Natural language communication with AI agent
• ●Multi-file editing with diff-based changes
• ●Terminal command execution and browser automation

StarCoder 2

✓

State-of-the-art open-access code LLM by BigCode

StarCoder 2 is an open-access code LLM family (3B/7B/15B) from BigCode (Hugging Face & ServiceNow), trained on The Stack v2. Weights are released under OpenRAIL-M for local or hosted inference.

• ●Open-access weights (OpenRAIL-M)
• ●3 sizes: 3B, 7B, 15B parameters
• ●Trained on The Stack v2

Supermaven

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Fast AI code completions with 1M-token context on Pro/Team

Supermaven delivers fast code completions and chat across VS Code, JetBrains, and Neovim. The Pro and Team tiers unlock a 1 million token context window, larger models, and monthly chat credits; Free includes core completions. Teams get centralized billing and user management.

• ●Ultra-fast code completions across large codebases
• ●1 million token context on Pro/Team
• ●Chat with GPT-4o, Claude 3.5 Sonnet, and other leading models

Tabnine

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Private AI coding assistant with free, pro, enterprise, and agentic tiers

Tabnine is an AI coding platform focused on privacy-first enterprise adoption with IDE completions, chat agents, and private deployment options (SaaS, VPC, on-prem, and air-gapped). Current public plans include Basic (free), Pro, Enterprise, and Agentic Platform, with support for organization-level controls, secure model routing, and customer-selected model providers.

• ●AI code completions and chat across major IDEs
• ●Workflow agents for tests, Jira tasks, and code review
• ●Org-aware context from Git, docs, Jira, and Confluence

Trae IDE

AI-powered code editor with real-time assistance and SOLO agent

Trae IDE is an AI-powered code editor from ByteDance that combines full IDE functionality with real-time AI assistance. It provides code editing, project management, extensions, and version control, plus AI chat for code explanations, documentation, error fixes, and suggestions. Trae IDE supports intelligent code generation from natural language and offers zero-to-production development. It integrates with GitHub and supports seamless migration from VS Code and Cursor. Built-in models include Claude 3.5 Sonnet, Claude 3.7 Sonnet, DeepSeek R1, and DeepSeek V3. The SOLO agent feature orchestrates browser, terminal, and editor for end-to-end development.

• ●Full IDE: editing, project management, extensions, version control
• ●Real-time AI chat for explanations, fixes, documentation
• ●Code generation from natural language

v0

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Generative UI builder with credits-based plans, Vercel deploys, and v0 Agent API

v0 by Vercel generates and edits React UIs from prompts with Tailwind/shadcn patterns, design mode, Figma import, GitHub sync, and one-click deploys to Vercel. Pricing is credits-based: Free ($5 monthly credits, 7 messages/day), Premium $20 with more credits and larger attachments, Team $30/user, Business $80/user with training opt-out, and Enterprise with SAML/SLAs. The v0 Agent API offers v0 Agent and v0-1.5 models with per-token pricing.

• ●Generate and refine React UIs from prompts
• ●Tailwind + shadcn patterns with responsive defaults
• ●Design Mode visual editing and GitHub sync

Vercel AI SDK

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Open-source TypeScript toolkit for streaming LLM apps with providers, tools, and generative UI

Vercel AI SDK (v6 beta) is a free, open-source toolkit for building streaming AI apps across Next.js, React, Vue/Nuxt, SvelteKit, and Node/Edge runtimes. It provides a unified provider API, tool calling, structured outputs (`generateObject`), server actions/RSC hooks, and generative UI helpers like `streamUI`, with adapters for OpenAI, Anthropic, Google, Mistral, Ollama, and more.

• ●Unified provider API with adapters for OpenAI/Anthropic/Google/Mistral/Ollama and more
• ●Streaming text, chat, and tool calls with React/Next server actions and RSC hooks
• ●Structured outputs via `generateObject` with schema validation

Warp

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AI-native terminal with Oz cloud agent orchestration, Warp Drive, and Terminal-Bench #1 performance

Warp is an AI-native terminal reimagined as an Agentic Development Environment, built in Rust for speed and reliability. With 700K+ active developers and $73M+ in funding, Warp offers Agent Mode (Pair and Dispatch modes for autonomous task execution), Warp Drive for team knowledge sharing, and the Oz cloud agent orchestration platform launched February 10, 2026. Oz enables parallel cloud agents with cron scheduling, Slack/GitHub/Linear triggers, and multi-repo support. Warp holds the #1 position on Terminal-Bench at 52% and achieves 75.8% on SWE-bench when paired with GPT-5.

• ●Agent Mode: multi-step autonomous task execution in the terminal
• ●Pair Mode: AI assists alongside you as you work
• ●Dispatch Mode: AI works independently on complex tasks

Zed

High-performance Rust code editor with agentic AI and open-source edit prediction

Zed is a high-performance code editor built in Rust with integrated AI capabilities. It runs at 120fps with minimal latency and uses multiple CPU cores and GPU efficiently. Zed offers agentic editing where AI agents can search codebases, make changes, and write code with real-time review. It includes Zeta, an open-source language model for edit prediction, inline assistant for sending code to LLMs, and text-based chat. Zed supports Claude, OpenAI, Anthropic, Ollama, and other providers. It features native Git support, multiplayer collaboration, and is open-source under GPL v3.

• ●Agentic editing: AI agents search, edit, and write with real-time review
• ●Zeta: open-source edit prediction model
• ●Inline assistant: send code to LLMs for transformation