Best AI Tools forAI Development Framework

LangChain

AI Development Framework

LangChain is an open-source framework for developing applications powered by large language models. It provides tools for chaining LLM calls, connecting to external data sources, and building autonomous agents. Raised $125M at $1.25B valuation.

bunshin-go

AI Development Framework

bunshin-go is a Go port of LangChain, LangGraph, and LangSmith that brings production-grade LLM pipeline primitives to the Go ecosystem. It eliminates Python's GIL concurrency limitations with goroutines, adds compile-time type safety via generics, and ships as a single static binary with sub-1ms startup. Supports OpenAI, Anthropic, Google, and Ollama providers with MCP tool discovery, streaming workflows, and a built-in eval harness.