LangChain, LlamaIndex, AutoGen, CrewAI

These frameworks help build Gen AI and agent systems faster by providing reusable components.

Framework	Strength	Typical Use
LangChain	Chains, tools, prompt pipelines	General LLM apps
LlamaIndex	Data connectors + RAG indexing	Knowledge assistants
AutoGen	Agent conversation patterns	Multi-agent workflows
CrewAI	Role-based agent orchestration	Task teams with shared goals

How to choose

• For RAG-heavy apps, start with LlamaIndex or LangChain.
• For multi-agent collaboration, evaluate AutoGen and CrewAI.
• Pick based on observability, ecosystem, and team familiarity.