Mastra

LangChain / LangGraph

Open-source framework for LLM apps and stateful agents

Why it ranks · Largest ecosystem; LangGraph for production agents

FreeComplex, controllable agent workflows

OpenAI Agents SDK

Lightweight open-source SDK for multi-agent workflows

Why it ranks · Simple primitives, built-in tracing

FreeTeams on OpenAI models

CrewAI

Framework for role-based multi-agent crews

Why it ranks · Easiest mental model for multi-agent teams

FreeMulti-agent role-play setups

Microsoft AutoGen

Open-source multi-agent conversation framework

FreeResearch and multi-agent experiments

LlamaIndex

Data framework for RAG and agents over your data

FreeRAG over documents