Promptflow

LiteLLM provides a unified interface and proxy gateway for LLM calls, simplifying multi-model switching, routing, and cost control.

Haystack is an enterprise-grade framework for RAG and search applications, covering document processing, retrieval, generation, and evaluation end to end.

Flowise is a low-code builder for LLM apps that lets you create agent workflows and RAG applications with drag-and-drop interfaces.

LangGraph is an agent workflow orchestration framework from the LangChain team, using graph structures to model agent state and transitions.