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Open source · Python

Best Python agent frameworks

The open-source agent frameworks written in Python, from the Agent Search Engine index — ranked by real maintained adoption (GitHub stars and recent commit activity), never by sponsorship. Every project here is Python-first, self-hostable, and free to run; the trade-off is you host and maintain it yourself. Right now it's led by langchain (144k stars), with autogen and crewAI close behind. Rankings shift as projects gain stars and ship commits.

21 open-source records · all agent frameworks · more best-of lists · how we rank

langchainFrameworkThe agent engineering platform.Python · 144k stars · MIT · Aug 2026autogenFrameworkA programming framework for agentic AIPython · 60k stars · CC-BY-4.0 · Apr 2026crewAIFrameworkFramework for orchestrating role-playing, autonomous AI agents. By fostering collaborative intelligence, CrewAI empowers agents to work together seamlessly, tackling complex tasks.Python · 57k stars · MIT · Aug 2026pydantic-aiFrameworkAI Agent Framework, the Pydantic wayPython · 19k stars · MIT · Aug 2026SuperAGIFramework<> SuperAGI - A dev-first open source autonomous AI agent framework. Enabling developers to build, manage & run useful autonomous agents quickly and reliably.Python · 18k stars · MIT · Jan 2025agent-frameworkFrameworkA framework for building, orchestrating and deploying AI agents and multi-agent workflows with support for Python and.NET.Python · 13k stars · MIT · Aug 2026hiveFrameworkMulti-Agent Harness for Production AIPython · 11k stars · Apache-2.0 · Aug 2026UpsonicFrameworkBuild autonomous AI agents in Python.Python · 7.9k stars · MIT · Jun 2026harness-sdkSDK / libraryBuild an agent harness and control it end-to-end. Open-source SDK for production AI agents in Python & TypeScript - any model, any cloud.Python · 6.9k stars · Apache-2.0 · Aug 2026intentkitFrameworkIntentKit is an open-source, self-hosted cloud agent cluster that manages a collaborative team of AI agents for you.Python · 6.5k stars · MIT · Aug 2026agent-governance-toolkitSDK / libraryAI Agent Governance Toolkit — Policy enforcement, zero-trust identity, execution sandboxing, and reliability engineering for autonomous AI agents. Covers 10/10 OWASP Agentic Top 10.Python · 6.0k stars · MIT · Aug 2026agentsFrameworkAn Open-source Framework for Data-centric, Self-evolving Autonomous Language AgentsPython · 6.0k stars · Apache-2.0 · Sep 2024
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rllmFrameworkDemocratizing Reinforcement Learning for LLMsPython · 5.8k stars · Apache-2.0 · Aug 2026ag2FrameworkAG2 (formerly AutoGen): The Open-Source AgentOS.Join us at: https://discord.gg/sNGSwQME3xPython · 4.9k stars · Apache-2.0 · Aug 2026youtu-agentFrameworkA simple yet powerful agent framework that delivers with open-source modelsPython · 4.6k stars · Mar 2026fast-agentFrameworkCode, Build and Evaluate agents - excellent Model and Skills/MCP/ACP/A2A SupportPython · 3.9k stars · Apache-2.0 · Aug 2026Vibe-SkillsSDK / libraryVibe-Skills is an all-in-one AI skills package.Python · 2.9k stars · Apache-2.0 · Aug 2026harmonistFrameworkPortable AI agent orchestration with mechanical protocol enforcement. 186 agents, zero runtime dependencies.Python · 2.3k stars · MIT · Jun 2026verl-agentFrameworkverl-agent is an extension of veRL, designed for training LLM/VLM agents via RL. verl-agent is also the official code for paper "Group-in-Group Policy Optimization for LLM Agent Training"Python · 2.2k stars · Apache-2.0 · Jun 2026DemoGPTFrameworkCreate LLM agents in a second with your prompts. Everything you need to create an LLM Agent - tools, prompts, frameworks, and models - all in one place.Python · 1.9k stars · MIT · Apr 2026AgentlyFramework[GenAI Application Development Framework] Build GenAI application quick and easy Easy to interact with GenAI agent in code using structure data and chained-calls syntax Use Event-Driven FlowPython · 1.6k stars · Apache-2.0 · Aug 2026

Frequently asked

What are the best Python agent frameworks?
The Python projects listed below, ranked by maintained adoption — GitHub stars plus recent commit activity — so you see what's genuinely used and still maintained, not abandoned.
Are these Python agent frameworks open source and free?
Yes — every project on this page is open source and written primarily in Python. The software is free to run and self-host; you still pay for the infrastructure you run it on and any model or API usage it makes.
Why choose Python agent frameworks specifically?
Staying in your team's primary language — Python — makes self-hosting, extending, and debugging far easier, because you can read and modify the source directly instead of treating it as a black box.