langchain4j license, foundation and stars

LLM application frameworks · Apache 2.0 (open source) · 13,342 stars

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LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It integrates seamlessly with enterprise Java frameworks like Quarkus and Spring Boot.

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Project	License	Stars	Per week	Latest release
DifyBuild Agentic workflows, RAG pipelines, with rich AI model and tool support on one collaborative workspace.LangGeniusDify Open Source License (Apache 2.0 with multi-tenant SaaS and logo restrictions)	Dify Open Source License (Apache 2.0 with multi-tenant SaaS and logo restrictions)changed Jul 2023	161k	+524	1.17.1Sep 10, 2026
Open WebUIUser-friendly AI Interface (Supports Ollama, OpenAI API,...).Open WebUIOpen WebUI License (BSD-3-Clause plus branding-preservation clause)	Open WebUI License (BSD-3-Clause plus branding-preservation clause)changed Apr 2025	158k	+753	-
langflowLangflow is a powerful tool for building and deploying AI-powered agents and workflows.MIT	MIT	156k	+171	-
LangChainThe agent engineering platform.LangChainMIT	MIT	149k	+308	langchain-core==1.6.5Sep 24, 2026
ragflowRAGFlow is an agent-native database: a Retrieval-Augmented Generation (RAG) engine that grew into context infrastructure.Apache 2.0	Apache 2.0	93.6k	+384	-
deer-flowAn open-source long-horizon SuperAgent harness that researches, codes, and creates.MIT	MIT	85.2k	+321	-
gpt_academicA framework for LLM applications by binary-husky, written in Python.GPL v3	GPL v3	71.6k	+36	-
mem0The Memory Layer for AI Agents - Drop-in memory infrastructure for AI agents and apps.Apache 2.0	Apache 2.0	68.3k	+383	-