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The best Agent frameworks

Free, open-source SDKs for building your own agents — multi-agent orchestration, document retrieval, low-level control, typed output, and JS-native stacks.

14 agentsResearched & quality-gated

All Agent frameworks

14 agents

  • LangGraph

    Open-source, MIT-licensed framework for building stateful, multi-agent AI workflows on cyclical graphs.

    Agent frameworksPaid
    ClaudeEnterpriseFree tierVerified 4 days ago

  • AgentsKitVerified

    Open-source, MIT-licensed JS/TS toolkit for building AI agents with a 10KB zero-dependency core and 50 built-in integrations.

    Agent frameworksPaid
    Open sourceSelf-hostedVerified 7 days ago

  • Agno

    An Apache 2.0 Python agent SDK and AgentOS runtime, with a Control Plane you run in your own cloud.

    Agent frameworksFreemium
    ClaudeFree tierGPTVerified 4 days ago

  • Claude Agent SDK

    Anthropic's own agent-building library: the same agent loop, tools and context management that power Claude Code, for Python and TypeScript. Claude-only, with no multi-provider escape hatch.

    Agent frameworksFreemium
    ClaudeFree tierMulti-agentVerified 4 days ago

  • Google Agent Development Kit

    Google's open-source, code-first agent SDK with five language runtimes (Python, TypeScript, Go, Java, Kotlin), native A2A and MCP support, and an optional managed runtime on Google Cloud.

    Agent frameworksFreemium
    ClaudeFree tierGPTVerified 4 days ago

  • Microsoft Agent Framework

    Microsoft's unified, MIT-licensed agent SDK for .NET and Python: the supported successor to AutoGen and Semantic Kernel.

    Agent frameworksFreemium
    ClaudeFree tierGPTVerified 3 days ago

  • The The Agents Index digest

    New Agent frameworks agents, fresh verdicts, moves in the rankings. One short email, every week.

  • Mastra

    The TypeScript-native agent framework. Agents, durable workflows, memory and observability in one Apache 2.0 package, with an optional managed cloud platform.

    Agent frameworksFreemium
    ClaudeEnterpriseFree tierVerified 4 days ago

  • Letta

    Letta is the open-source framework behind Letta Code, a stateful coding agent whose memory, skills, and identity persist across sessions rather than rebuilding context on every call.

    Agent frameworksFreemium
    EnterpriseFree tierOpen sourceVerified 4 days ago

  • LlamaIndex

    Open-source data framework for LLM apps, with LlamaParse as the paid agentic OCR for messy documents and LlamaAgents for document workflows.

    Agent frameworksFreemium
    ClaudeEnterpriseFree tierVerified 4 days ago

  • Microsoft AutoGen

    Microsoft's open-source framework for orchestrating conversations between multiple AI agents. Now in maintenance mode.

    Agent frameworksFree
    Free tierGPTMulti-agentVerified 4 days ago

  • OpenAI Agents SDK

    OpenAI's lightweight open-source framework for building agents in Python and TypeScript, with handoffs, guardrails, tracing and a sandboxed workspace mode for long-running work.

    Agent frameworksFree
    Free tierGPTMulti-agentVerified 4 days ago

  • Pydantic AI

    The Python AI SDK for type-safe agents, realtime voice, image generation and embeddings, with every model a string swap away.

    Agent frameworksFree
    ClaudeFree tierGPTVerified 4 days ago

  • CrewAI

    Open-source Python framework for role-based multi-agent crews, with a hosted build and runtime that adds enterprise governance, native SDKs for the major LLMs, and Ollama via LiteLLM.

    Agent frameworksFreemium
    EnterpriseFree tierGPTVerified 4 days ago

  • LangChain

    The most widely-used framework for building LLM apps and agents, with LangGraph for stateful multi-agent control: open-source and free to self-host.

    Agent frameworksFreemium
    Free tierGPTMulti-agentVerified 4 days ago

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