# 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 (143k stars), with autogen and crewAI close behind. Rankings shift as projects gain stars and ship commits.

21 open-source records, ranked by maintained GitHub adoption; sponsorship never affects the ranking. Browse on the web: https://agentsearchengine.app/best/python-agent-frameworks

## Ranked

1. [langchain](https://agentsearchengine.app/agents/langchain) — The agent engineering platform. · Open source · Framework · 143k★ · Python · MIT · active 1 day ago · best for builders who want composable primitives and the broadest ecosystem of integrations for llm applications
2. [autogen](https://agentsearchengine.app/agents/autogen) — A programming framework for agentic AI · Open source · Framework · 60k★ · Python · CC-BY-4.0 · active 3 months ago · best for research-grade multi-agent conversation patterns backed by microsoft
3. [crewAI](https://agentsearchengine.app/agents/crewai) — Framework for orchestrating role-playing, autonomous AI agents. By fostering collaborative intelligence, CrewAI empowers agents to work together seamlessly, tackling complex tasks. · Open source · Framework · 57k★ · Python · MIT · active today · best for orchestrating role-based multi-agent crews in python with an approachable api
4. [pydantic-ai](https://agentsearchengine.app/agents/pydantic-ai) — AI Agent Framework, the Pydantic way · Open source · Framework · 19k★ · Python · MIT · active today · best for python teams that want type-safe agent development with the pydantic philosophy
5. [SuperAGI](https://agentsearchengine.app/agents/superagi) — <> SuperAGI - A dev-first open source autonomous AI agent framework. Enabling developers to build, manage & run useful autonomous agents quickly and reliably. · Open source · Framework · 18k★ · Python · MIT · active 1 year ago · best for provisioning and running concurrent autonomous agents with extensible tooling
6. [agent-framework](https://agentsearchengine.app/agents/agent-framework) — A framework for building, orchestrating and deploying AI agents and multi-agent workflows with support for Python and.NET. · Open source · Framework · 13k★ · Python · MIT · active today · best for production multi-agent workflows in .net or python with microsoft tooling
7. [hive](https://agentsearchengine.app/agents/hive) — Multi-Agent Harness for Production AI · Open source · Framework · 11k★ · Python · Apache-2.0 · active 2 months ago · best for production agent workloads needing state, failure recovery, and human oversight
8. [Upsonic](https://agentsearchengine.app/agents/upsonic) — Build autonomous AI agents in Python. · Open source · Framework · 7.9k★ · Python · MIT · active 1 month ago
9. [harness-sdk](https://agentsearchengine.app/agents/harness-sdk) — Build an agent harness and control it end-to-end. Open-source SDK for production AI agents in Python & TypeScript - any model, any cloud. · Open source · SDK / library · 6.8k★ · Python · Apache-2.0 · active today
10. [intentkit](https://agentsearchengine.app/agents/intentkit) — IntentKit is an open-source, self-hosted cloud agent cluster that manages a collaborative team of AI agents for you. · Open source · Framework · 6.5k★ · Python · MIT · active 2 days ago
11. [agents](https://agentsearchengine.app/agents/agents) — An Open-source Framework for Data-centric, Self-evolving Autonomous Language Agents · Open source · Framework · 6.0k★ · Python · Apache-2.0 · active 1 year ago
12. [rllm](https://agentsearchengine.app/agents/rllm) — Democratizing Reinforcement Learning for LLMs · Open source · Framework · 5.8k★ · Python · Apache-2.0 · active 3 days ago
13. [agent-governance-toolkit](https://agentsearchengine.app/agents/agent-governance-toolkit) — AI Agent Governance Toolkit — Policy enforcement, zero-trust identity, execution sandboxing, and reliability engineering for autonomous AI agents. Covers 10/10 OWASP Agentic Top 10. · Open source · SDK / library · 5.6k★ · Python · MIT · active today
14. [ag2](https://agentsearchengine.app/agents/ag2) — AG2 (formerly AutoGen): The Open-Source AgentOS.Join us at: https://discord.gg/sNGSwQME3x · Open source · Framework · 4.8k★ · Python · Apache-2.0 · active today
15. [youtu-agent](https://agentsearchengine.app/agents/youtu-agent) — A simple yet powerful agent framework that delivers with open-source models · Open source · Framework · 4.6k★ · Python · active 4 months ago
16. [fast-agent](https://agentsearchengine.app/agents/fast-agent) — Code, Build and Evaluate agents - excellent Model and Skills/MCP/ACP/A2A Support · Open source · Framework · 3.9k★ · Python · Apache-2.0 · active today
17. [Vibe-Skills](https://agentsearchengine.app/agents/vibe-skills) — Vibe-Skills is an all-in-one AI skills package. · Open source · SDK / library · 2.6k★ · Python · Apache-2.0 · active today
18. [harmonist](https://agentsearchengine.app/agents/harmonist) — Portable AI agent orchestration with mechanical protocol enforcement. 186 agents, zero runtime dependencies. · Open source · Framework · 2.4k★ · Python · MIT · active 1 month ago
19. [verl-agent](https://agentsearchengine.app/agents/verl-agent) — verl-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" · Open source · Framework · 2.2k★ · Python · Apache-2.0 · active 1 month ago
20. [DemoGPT](https://agentsearchengine.app/agents/demogpt) — Create 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. · Open source · Framework · 1.9k★ · Python · MIT · active 4 months ago
21. [Agently](https://agentsearchengine.app/agents/agently) — [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 Flow · Open source · Framework · 1.6k★ · Python · Apache-2.0 · active 3 days ago

## FAQ

**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.

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Source: [Agent Search Engine](https://agentsearchengine.app) — https://agentsearchengine.app/best/python-agent-frameworks