LangChain
langchain-ai/langchain
The most widely used framework for LLM-powered applications.
LangChain provides chains, tool abstractions, integrations and runnables for composing LLM applications. It became the default on-ramp for agent development and remains among the most-starred projects in the space.
Behind the project
In the news
Microsoft Agent Framework unifies AutoGen and Semantic Kernel
Microsoft announces the public preview of its Agent Framework, converging AutoGen's multi-agent research lineage with Semantic Kernel's enterprise abstractions — a major consolidation in orchestration frameworks.
Google open-sources the Agent Development Kit
Google launches ADK, a modular open-source framework for building agents with Gemini integration, multi-agent hierarchies and A2A support — Google's major entry into the framework wars.
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OpenClaw
openclaw/openclaw
The viral open-source personal AI assistant that really does things.
OpenClaw (born as Clawdbot in late 2025) is a self-hosted personal agent that connects your chats, email, browser and terminal into one always-on assistant. Its explosive growth — hundreds of thousands of stars within months — made 'personal agent harness' a mainstream category.
DeepSeek Harness
deepseek-ai/deepseek-harness
Everything is a Plugin — DeepSeek's open agent harness.
DeepSeek Harness is the breakout open-source harness of 2026: an architecture where everything — tools, subagents, even the loop itself — is a plugin. A Desktop app for macOS and Windows followed in October 2026, and the project passed 240k stars in under three months.
AutoGPT
Significant-Gravitas/AutoGPT
The 2023 experiment that started the autonomous agent wave.
AutoGPT gave GPT-4 a loop, a memory and tools and let it run — kicking off the entire autonomous-agent category. Now rebuilt as a platform for building, deploying and continuously improving agents.