Best Frameworks for Building AI Agents
The most-starred open-source frameworks for building agents, 15 hand-picked, ranked by real installs.
#Type
- 1pydantic-aiAI Agent Framework, the Pydantic wayAgentsJul 2026
- 2haystackOpen-source AI orchestration framework for building context-engineered, production-ready LLM applications. Design modular pipelines and agent workflows with explicit control over retrieval, routing, memory, and generation. Built for scalable agents, RAG, multimodal applications, semantic search, and conversational systems.AgentsJul 2026
- 3Claude CodeAnthropic's agentic coding tool that lives in your terminal and understands your whole codebase.Agentsthis week
- 4oh-my-claudecodeTeams-first Multi-agent orchestration for Claude CodeAgentsJul 2026
- 5MetaGPT🌟 The Multi-Agent Framework: First AI Software Company, Towards Natural Language ProgrammingAgentsJan 2026
- 6AstrBotAI Agent Assistant & development framework that integrates lots of IM platforms, LLMs, plugins and AI feature, and can be your openclaw alternative. ✨AgentsJul 2026
- 7Open-AutoGLMAn Open Phone Agent Model & Framework. Unlocking the AI Phone for EveryoneAgentsMar 2026
- 8claude-code-best-practicefrom vibe coding to agentic engineering - practice makes claude perfectAgentsJul 2026
- 9autogenA programming framework for agentic AIAgentsApr 2026
- 10crewAIFramework for orchestrating role-playing, autonomous AI agents. By fostering collaborative intelligence, CrewAI empowers agents to work together seamlessly, tackling complex tasks.AgentsJul 2026
- 11ClineAn autonomous coding agent inside VS Code that plans, edits files and runs commands with your approval.Agentsthis week
- 12GPT ResearcherAutonomous agent for deep online research with cited reportsAgents3 days ago
- 13agenticSeekFully Local Manus AI. No APIs, No $200 monthly bills. Enjoy an autonomous agent that thinks, browses the web, and code for the sole cost of electricity. Also checkout AgenticSeek successor 3Toks! https://github.com/Fosowl/3toksAgentsJul 2026
- 14pentagiFully autonomous AI Agents system capable of performing complex penetration testing tasksAgentsJul 2026
- 15Roo CodeAn autonomous coding agent for VS Code — a whole dev team of AI agents in your editor.Agentsthis week
More collections
Official PublishersOfficial SkillsBest AI Agents for CodingBest Claude Skills for CodingBest MCP ServersBest AI Skills for Marketing & SEOBest Browser Automation Tools for AgentsBest Database MCP ServersBest AI Agents for ResearchBest AI Skills for WritingBest AI Skills for ResearchBest AI Skills for StudentsBest AI Agents for BusinessBest AI Agents for Data AnalysisBest MCP Servers for DevOpsBest MCP Servers for ProductivityBest AI Security ToolsBest AI Skills for DesignersLocal-First AI ToolsBest Claude SkillsBest AI SkillsBest Claude Code PluginsBest Claude SubagentsBest AI Agent WorkflowsBest AI Prompts for Agents