langchain-ai/langchain

langchain-ai/langchain remains the original framework for chaining LLM calls, tools, and memory, and its 136,381 stars keep it on the chart. Despite newer entrants in the AI stack, it still commands a dedicated following due to unmatched flexibility and thoroughly documented 500+ integration recipes. It is 0.13% less starred than the #9 open-webui/open-webui, yet its modular architecture remains cheaper to extend than building from scratch with raw APIs. Each release includes 3+ benchmark improvements in latency, proving that community documentation still outweighs shiny new features.