# Best Agent frameworks agents — The Agents Index

> Source: https://theagentsindex.com/category/frameworks (curated, quality-gated, re-verified)

Frameworks and SDKs to build your own agents — orchestration, memory, tools and multi-agent control.

2 quality-gated agents in this category. Each name links to its answer-first markdown twin.

| Name | What it is | Pricing | API |
| --- | --- | --- | --- |
| [LangChain](https://theagentsindex.com/langchain.md) | The most widely-used framework for building LLM apps and agents — with LangGraph for stateful control. | freemium | Yes |
| [CrewAI](https://theagentsindex.com/crewai.md) | A popular open-source framework for role-based, collaborating multi-agent teams. | freemium | Yes |