Skip to content

The datasheet for every AI agent

ShortlistSearchSearch agents (press slash)Submit an agent

agents · Category

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.

16 agents9 verified in the last 30 days9 updated in that window

Explore this section

Browse the full category, newest first. How listings are ordered →

More filters →

All Agent frameworks

16 agents

  • Langflow

    Open-source visual builder for AI agents, RAG apps and MCP servers, with an API server included.

    Agent frameworksFree
    APIAutonomousClaudeVerified 12 days ago

  • LangGraph

    Open-source orchestration framework and runtime for stateful, long-running LLM agents, from LangChain.

    Agent frameworksFree, then $39/month
    APIAutonomousClaudeVerified last month

  • AgentsKitVerified

    Composable MIT-licensed TypeScript packages for agent runtime, tools, memory, RAG and chat UI.

    Agent frameworksFree
    APIAutonomousClaudeVerified 3 days ago

  • Agno

    Python SDK, open-source AgentOS runtime and hosted control plane for building and operating agents.

    Agent frameworksFree, then $150/month
    APIAutonomousClaudeVerified last month

  • Claude Agent SDK

    Python and TypeScript library that runs Claude Code's agent loop and tools inside your own application.

    Agent frameworksFrom $1/million input tokens
    APIAutonomousClaudeVerified last month

  • Google Agent Development Kit (ADK)

    Open-source framework for building, evaluating and deploying AI agents in Python, TypeScript, Go, Java or Kotlin.

    Agent frameworksFree
    APIAutonomousClaudeVerified 21 days ago

  • The Agents Index digest

    New additions and updated research in Agent frameworks. One short email, every week.

  • Microsoft Agent Framework

    Open-source .NET, Python and Go SDK for building AI agents and graph-based multi-agent workflows.

    Agent frameworksFree
    APIAutonomousClaudeVerified 17 days ago

  • Mastra

    Open-source TypeScript framework for building AI agents, with a hosted platform for running and observing them.

    Agent frameworksFree, then $250/month
    APIAutonomousClaudeVerified last month

  • Letta

    Stateful agent harness, cloud and SDK for agents with persistent, git-versioned memory.

    Agent frameworksFree, then $20/month
    APIAutonomousClaudeVerified last month

  • LiveKit Agents

    Open-source Python and Node.js framework for voice AI agents, with LiveKit Cloud hosting, telephony and observability.

    Voice agentsFree, then $50/month
    APIAutonomousClaudeVerified last month

  • AutoGen

    Open-source Microsoft framework for building single and multi-agent AI applications in Python.

    Agent frameworksFree
    APIAutonomousClaudeVerified 17 days ago

  • LlamaIndex

    Open-source agent framework plus a credit-metered document parsing, extraction and indexing platform.

    Agent frameworksFree, then $50/month
    APIClaudeEnterpriseVerified last month

  • OpenAI Agents SDK (Python)

    Open-source Python framework for building agents with tools, handoffs, guardrails and tracing.

    Agent frameworksFree
    APIAutonomousFree tierVerified 16 days ago

  • Pydantic AI

    Open-source Python agent framework from the Pydantic team, with a typed agent loop and swappable models.

    Agent frameworksFree
    APIAutonomousClaudeVerified 15 days ago

  • CrewAI

    Open-source multi-agent framework with a managed platform for deploying and governing agent workflows.

    Agent frameworksFree
    APIAutonomousClaudeVerified 23 days ago

  • LangChain

    Open source agent frameworks plus LangSmith, a hosted platform to trace, evaluate, deploy and govern agents.

    Agent frameworksFree, then $39/seat/month
    APIAutonomousClaudeVerified 18 days ago
About this update

Newest check Oct 4, 2026 · oldest 34 days ago.