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langchain4j / langchain4j
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.
headroomlabs-ai / headroom
Author description: Compress tool outputs, logs, files, and RAG chunks before they reach the LLM. 20% fewer tokens for coding agents, 60-95% fewer tokens for JSON, same answers. Library, proxy, MCP server.
Popularity
Repository stars13,36779,009Highest
Fork2,6656,175Highest
Maintenance
Last push2026-11-062026-11-06
Maintenance notesNot verifiedNot verified
Repository created2023-06-202026-01-07
License & use
LicenseApache-2.0 · PermissiveApache-2.0 · Permissive
PricingPricing not verifiedPricing not verified
Basics
Browse by purposeAI & agents · Developer toolsRetrieval-augmented generation
TypeFrameworks & SDKsFrameworks & SDKs
SubcategoryModel SDKsModel SDKs
PlatformNot verifiedNot verified
First collected2026-11-032026-11-03
LanguageJavaPython
License tiers are derived from metadata. Check obligations for your use; unknown does not mean prohibited. Measured at 2026-11-06 UTC