Free & Open Source

Aider

✓

Open-source terminal pair programmer with git-native workflows

Aider (v0.86.1) is an open-source AI pair programming tool that runs in the terminal and keeps your workflow inside git. It can automatically create sensible commits, apply diff-based edits across multiple files, and map your repository to work on large projects. Aider works best with Claude 3.7 Sonnet, DeepSeek R1/V3, OpenAI GPT-4.1 and o3/o4-mini, and Gemini 2.5 Pro, while also supporting many other cloud and local models (via OpenRouter, Ollama, and direct API keys).

Amazon Q Developer

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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.

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.

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.

Windsurf (Codeium)

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AI coding IDE with Cascade agent, Tab completions, and prompt credits

Codeium now directs to Windsurf, an AI coding IDE and plugin suite featuring the Cascade agent, Tab completions, and prompt credits usable across providers (OpenAI, Claude, Gemini, xAI). Free users get 25 prompt credits per month with unlimited Tab completions/inline edits; paid tiers add Fast Context, Windsurf Reviews, admin controls, and more credits. Windsurf also ships the in-house SWE-1.5 coding model alongside access to external models (see pricing for details).

Amazon CodeWhisperer

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Superseded by Amazon Q Developer for code generation, chat, and security scans

CodeWhisperer is no longer offered as a standalone product. AWS merged its completions, chat, and security scanning into Amazon Q Developer for VS Code, JetBrains, and CLI. New users should install Amazon Q Developer (Free or Pro), which now carries the CodeWhisperer functionality and billing.

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.

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.

Cursor

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The AI-first code editor built to make you extraordinarily productive

Cursor is an AI-powered code editor built on a fork of VS Code. It lets you write, edit, and chat about your code with frontier AI models like GPT-4.1, Claude 3.5 Sonnet, and Gemini 2.5 Pro. Cursor integrates AI directly into the editor with features like Tab (autocomplete), Composer (multi-file editing), and Agent (autonomous tasks), enabling a flow state where you can build software faster than ever before.

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.

LangChain & LangGraph

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LangChain for LLM apps; LangGraph for stateful graph agents

LangChain provides provider-agnostic LLM tooling, while LangGraph adds a graph-based runtime for controllable, stateful agents with human-in-the-loop, persistence, and streaming. Both are open source with Python/JS SDKs and a growing ecosystem of integrations and middleware.

LangChain

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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.

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.

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.

Pieces for Developers

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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.

Project IDX (now Firebase Studio)

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Firebase Studio: agentic cloud IDE with Gemini in Firebase and free workspaces

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.

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.

StarCoder 2

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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.

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.

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.

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.

Warp Terminal

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Agentic terminal with credits-based plans, agents 3.0, and SOC2/SSO on business

Warp is a modern terminal with AI agents, code-aware blocks, and collaboration. Free includes limited credits and frontier model access; Build starts at $20/month with 1,500 AI credits and BYO key; Business $50/user/month adds SOC 2, SAML SSO, and enforced ZDR. Agents 3.0 run in-terminal and via Slack/Linear; Warp Drive syncs objects and prompts across teams.