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Open source · self-hostable

Best open-source agent frameworks

The open-source agent frameworks in the index — self-hostable, inspectable, and free to run. Ranked by real maintained adoption (GitHub stars and recent commit activity), never by sponsorship. Open source buys you control, privacy, and no vendor lock-in; the trade-off is that you host and maintain it yourself. Right now it's led by langchain (144k stars), with ruflo and autogen close behind. Rankings shift as projects gain stars and ship commits.

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

langchainFrameworkThe agent engineering platform.Python · 144k stars · MIT · Aug 2026rufloFrameworkThe leading agent meta-harness. Deploy intelligent multi-player swarms, coordinate autonomous workflows, and build conversational AI systems.TypeScript · 68k 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 2026elizaFrameworkOpen source agentic operating systemTypeScript · 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 2026evolverFrameworkThe GEP-powered self-evolving engine for AI agents. Auditable evolution with Genes, Capsules, and Events. | evomap.aiJavaScript · 9.0k stars · GPL-3.0 · Aug 2026UpsonicFrameworkBuild autonomous AI agents in Python.Python · 7.9k stars · MIT · Jun 2026yaoFrameworkBuild AI agents and web apps — with a single binary.Go · 7.6k stars · Aug 2026
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harness-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 2026open-multi-agentFrameworkTypeScript multi-agent orchestration framework. Describe a goal, a coordinator decomposes it into a task DAG that runs on any LLM: Claude, ChatGPT, Gemini, DeepSeek, or local models.TypeScript · 6.8k stars · MIT · 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 2024rllmFrameworkDemocratizing 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 2026opengapFrameworkA framework-agnostic, git-native standard for defining AI agentsTypeScript · 2.9k stars · MIT · Jul 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 2026yomoFrameworkServerless AI Agent Framework with Geo-distributed Edge AI Infra.Rust · 1.9k stars · Aug 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 2026flowcraftSDK / libraryProduction-grade Go SDK for building AI agents with long-term memory, knowledge retrieval, and voice — runnable as a library, a daemon, or a real-time pipeline.Go · 416 stars · MIT · Aug 2026

Frequently asked

What are the best open-source agent frameworks?
The projects listed below, ranked by maintained adoption — GitHub stars plus recent activity — so you see what's genuinely used and still maintained, not abandoned.
Are open-source agent frameworks free?
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.
Open-source or commercial agent frameworks — which should I choose?
Pick open source for control, privacy, and no lock-in when you're happy to host and maintain it; pick a commercial product for a managed, supported experience. You can compare both in the full agent frameworks category.