Best AI Agent Tools on GitHub in 2026: 15 Open-Source Projects with Real Star Counts

15 open-source AI agent tools on GitHub, ranked by real stars pulled from the API on 2026-07-31.

💡 What You Will Learn

15 open-source AI agent tools on GitHub, ranked by real stars pulled from the API on 2026-07-31.

📜 Table of Contents

• Best AI Agent Tools on GitHub in 2026
• Agent frameworks (build your own agent)
• Ready-to-run agents
• Tool ecosystem
• Orchestration and memory
• How to choose
• FAQ

Best AI Agent Tools on GitHub in 2026

Star counts below were fetched from the GitHub API on 2026-07-31 by the ainomam star tracker. Use them as a popularity signal, not a quality verdict.

Agent frameworks (build your own agent)

1. langchain-ai/langchain - 143,097 stars. The agent engineering platform, now with LangGraph for stateful agents.
2. microsoft/autogen - 60,129 stars. Multi-agent conversation framework from Microsoft.
3. joaomdmoura/crewAI - 56,432 stars. Role-based agent crews, very approachable for beginners.
4. phidatahq/phidata - 41,526 stars. Build, run, and manage agent platforms.

Ready-to-run agents

1. All-Hands-AI/OpenHands - 82,697 stars. The open-source AI software engineer.
2. anthropics/claude-code - 139,794 stars. Claude terminal coding agent.
3. openai/codex - 102,894 stars. OpenAI lightweight coding agent.
4. cline/cline - 65,313 stars. VS Code autonomous coding agent.

Tool ecosystem

1. modelcontextprotocol/servers - 89,093 stars. Official MCP servers (filesystem, GitHub, Slack).
2. punkpeye/awesome-mcp-servers - 91,652 stars. Curated list of 10,000+ MCP servers.
3. browser-use/browser-use - 107,406 stars. Make websites accessible to AI agents.
4. composiohq/composio - 40k+ stars. 250+ integrations for agent tool use.

Orchestration and memory

1. n8n-io/n8n - 198,849 stars. Fair-code workflow automation with native AI capabilities.
2. mem0ai/mem0 - 62,202 stars. Universal memory layer for AI agents.
3. langflow-ai/langflow - 152,678 stars. Visual builder for agentic workflows.

How to choose

New to agents? Start with crewAI for simplicity or n8n for no-code. Building production software? LangGraph. Need a coding assistant today? Install cline in VS Code.

FAQ

Which one is most popular? n8n at 198,849 stars, followed by langflow and open-webui. Are these all free? All listed are open-source; claude-code and codex have paid tiers for heavy usage.

❓ FAQ

Which one is most popular?

n8n at 198,849 stars, followed by langflow and open-webui.

Are these all free?

All listed are open-source; claude-code and codex have paid tiers for heavy usage.