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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.

Godot JVM GDExtension. Support Kotlin, Java and Scala.

Java 面试八股文 + 企业级项目实战：Spring、Spring Boot、Spring Cloud、JVM、Redis、MySQL、分布式、微服务、AI Agent，附详细答案与学习路线。

Agent framework for the JVM. Pronounced Em-BAY-bel /ɛmˈbeɪbəl/

A meticulous HTTP client for the JVM, Android, and GraalVM.

✅ The programmer-friendly testing framework for Java and the JVM

Koog is a JVM (Java and Kotlin) framework for building predictable, fault-tolerant and enterprise-ready AI agents across all platforms – from backend services to Android and iOS, JVM, and even in-browser environments. Koog is based on our AI products expertise and provides proven solutions for complex LLM and AI problems

:rocket:  A strongly-typed, caching GraphQL client for the JVM, Android, and Kotlin multiplatform.

Vert.x is a tool-kit for building reactive applications on the JVM

:chart_with_upwards_trend: Capturing JVM- and application-level metrics. So you know what's going on.

A JVM-free Clojure runtime in Zig — call WebAssembly from Clojure to use libraries written in any language.

JRuby, an implementation of Ruby on the JVM

Gradle plugin for JVM projects written in Java, Kotlin, Groovy, or Scala; and Android projects written in Java or Kotlin. Provides advice for managing dependencies and other applied plugins

The implementation of the Rascal meta-programming language (including interpreter, type checker, parser generator, compiler and JVM based run-time system)

configuration library for JVM languages using HOCON files

🦋 Rakudo – Raku on MoarVM, JVM, and JS

Portable AI agent runtime for the JVM. One @Agent class runs on Spring AI, LangChain4j, Anthropic, or 9 more behind one SPI. Token streaming, tool calls, human approvals, and governance over WebSocket, SSE, gRPC, or WebTransport/HTTP3. Speaks MCP, A2A, and AG-UI.

A high performance scripting language hosted on the JVM.

Cucumber for the JVM

Framework for Evolutionary Message-Driven Microservices on the JVM

Frege is a Haskell for the JVM. It brings purely functional programing to the Java platform.

Fluent testing assertions for Java and the JVM

Suite of tools for deploying and training deep learning models using the JVM. Highlights include model import for keras, tensorflow, and onnx/pytorch, a modular and tiny c++ library for running math code and a java based math library on top of the core c++ library. Also includes samediff: a pytorch/tensorflow like library for running deep learn...

This is the simplest possible setup for Cucumber-JVM using Java with Maven.

RabbitMQ HTTP API client for Java, Groovy, and other JVM languages

The core implementation of the asset pipeline for the jvm

Terminate the JVM when resources are exhausted

🌏 A tiny 0-dependency thread-safe Java™ lib for setting/viewing dns programmatically without touching host file, make unit/integration testing portable; and a tiny tool for setting/viewing dns of running JVM process.

Apache Groovy: A powerful multi-faceted programming language for the JVM platform

Writing full-stack statically-typed web apps on JVM at its simplest