Most relevant for this one: Langchain

LangChain is the open-source standard for building, debugging, and deploying production-ready LLM applications and autonomous AI agents.

LangChain streamlines the entire development lifecycle for LLM-powered applications by providing a modular framework to chain together models, vector databases, and external APIs. With over 1,000 pre-built integrations, developers can quickly implement complex architectures (like retrieval-augmented generation and multi-agent workflows) using standard interfaces. The ecosystem extends seamlessly into LangGraph for stateful multi-agent orchestration and LangSmith for tracing, debugging, and evaluating live production runs.

https://www.langchain.com