Maven

JCToolsJCTools/JCTools

High-performance concurrent data structures for the JVM, supplementing the Java standard library.

Light-4jnetworknt/light-4j

A fast, lightweight, cloud-native microservices framework for Java with built-in cross-cutting concerns.

deequawslabs/deequ

A library built on Apache Spark for defining unit tests to measure data quality in large datasets.

Schema Spyschemaspy/schemaspy

A database metadata analyzer that generates interactive HTML documentation and entity-relationship diagrams.

KeyBoxskavanagh/KeyBox

A modern, web-based SSH console and key management tool that functions as a secure bastion host.

MCP Java SDKmodelcontextprotocol/java-sdk

The official Java SDK for building and consuming Model Context Protocol servers and clients, enabling Java apps to interact with AI models.

jitwatchAdoptOpenJDK/jitwatch

A log analyzer and visualizer for the Java HotSpot JIT compiler, enabling inspection of inlining, hot methods, bytecode, and assembly.

TruffleRubyoracle/truffleruby

A high-performance Ruby implementation built on GraalVM, offering parallel execution and polyglot interoperability.

HugeGraphapache/incubator-hugegraph

A fast, highly-scalable graph database supporting over 10 billion vertices and edges with OLTP capabilities and dual Gremlin/Cypher query language support.

TeaVMkonsoletyper/teavm

Compiles Java bytecode to JavaScript, WebAssembly, and C for running Java applications in web browsers and other environments.

binnavigoogle/binnavi

A binary analysis IDE for inspecting, navigating, editing, and annotating control flow graphs and call graphs of disassembled code.

elasticsearch-jdbcjprante/elasticsearch-jdbc

A Java-based tool for importing tabular data from JDBC sources into Elasticsearch for indexing.

JGraphTjgrapht/jgrapht

A free Java library providing mathematical graph-theory objects and algorithms.

mongo-java-drivermongodb/mongo-java-driver

Official MongoDB drivers for Java, Kotlin, and Scala applications to connect and interact with MongoDB databases.

j2v8eclipsesource/j2v8

High-performance Java bindings for the V8 JavaScript engine, enabling efficient JavaScript execution on the JVM.

OpenTripPlanneropentripplanner/OpenTripPlanner

An open-source multi-modal trip planner for public transit, walking, bicycling, and mobility services.

HotswapAgentHotswapProjects/HotswapAgent

A Java agent enabling unlimited runtime class and resource redefinition for faster development cycles.

Confluent Schema registry for Kafkaconfluentinc/schema-registry

A RESTful service for storing, retrieving, and managing Avro, JSON Schema, and Protobuf schemas in Apache Kafka ecosystems.

ta4jta4j/ta4j

A Java library for building, testing, and deploying automated trading strategies with 200+ technical indicators and production-ready tooling.

webcam-capturesarxos/webcam-capture

A Java library for accessing integrated or USB webcams with a simple API and support for multiple capture frameworks.

Universal-G-Code-Senderwinder/Universal-G-Code-Sender

A cross-platform Java application for sending G-Code to CNC controllers like GRBL, Smoothieware, TinyG, and g2core.

Plantumlplantuml/plantuml-server

A web application that generates UML diagrams from text descriptions on-the-fly.

Freeciv-webfreeciv/freeciv-web

An open-source turn-based strategy civilization-building game playable in HTML5 and WebGL browsers.

TinkerPop3 implementationapache/tinkerpop

A graph computing framework providing the Gremlin query language and tools for both graph databases (OLTP) and graph analytic systems (OLAP).

TwelveMonkeysharaldk/TwelveMonkeys

Extends Java ImageIO with plugins for reading and writing over 30 image formats, including legacy and modern formats.

Jestsearchbox-io/Jest

A Java HTTP REST client for Elasticsearch, providing an alternative to the native Java API.

Protostuffprotostuff/protostuff

A Java serialization library with built-in support for forward-backward compatibility and validation.

Tabulatabulapdf/tabula-java

A Java library and command-line tool for extracting tables from PDF files.

Apache ServiceComb Java Chassisapache/servicecomb-java-chassis

An SDK for rapid development of microservices in Java with service registration, discovery, routing, and management.

docker-maven-pluginfabric8io/docker-maven-plugin

A Maven plugin for building Docker images and managing containers for integration tests.

SpoonINRIA/spoon

A metaprogramming library for analyzing and transforming Java source code via a well-designed AST.

ParparVMcodenameone/CodenameOne

Cross-platform framework for building truly native mobile apps with Java or Kotlin, supporting iOS, Android, Desktop & Web.

Codename Onecodenameone/CodenameOne

A cross-platform framework for building truly native mobile apps with Java or Kotlin, supporting iOS, Android, Desktop, and Web.

jvm-profileruber-common/jvm-profiler

A Java Agent for distributed JVM profiling, collecting metrics and tracing methods for Hadoop/Spark applications.

graphql-kotlinExpediaGroup/graphql-kotlin

A collection of libraries for building and running GraphQL clients and servers in Kotlin.

Gaffergchq/Gaffer

A graph database framework for storing and querying large-scale graphs with rich properties and in-database aggregation.