8 tools

AI Frameworks

Agent frameworks are the developer libraries for building your own AI agents: tool calling, memory, multi-agent orchestration and workflows. Most are open source and available for Python, TypeScript or both.

Read our comparison: Best AI Agent Frameworks in 2026 →

LangChain

langchain.com

Framework (and LangGraph) for building LLM agents.

FrameworksOpen Source

CrewAI

crewai.com

Framework for orchestrating role-playing multi-agent crews.

FrameworksOpen Source

AutoGen

microsoft.github.io

Microsoft's framework for multi-agent applications.

FrameworksOpen Source

LlamaIndex

llamaindex.ai

Framework for agents over your data.

FrameworksOpen Source

OpenAI Agents SDK

openai.github.io

Lightweight SDK for building multi-agent workflows.

FrameworksOpen Source

Pydantic AI

ai.pydantic.dev

Type-safe Python agent framework from the Pydantic team.

FrameworksOpen Source

Mastra

mastra.ai

TypeScript framework for AI agents and workflows.

FrameworksOpen Source

Letta

letta.com

Platform for stateful agents with long-term memory.

FrameworksOpen Source

Other categories

Coding Agents 10App Builders 4General Agents 5Research Agents 2Browser Agents 3Automation 6Customer Support 4Sales 3Voice Agents 3Observability 2Infrastructure 2