Top JAVA GitHub Repositories & Tools (2026)

Firebase Admin Java SDK

Linear Algebra for Java

SingleFile version compatible with Manifest V3

A libyaml wrapper for Ruby

Open-source systems management and configuration platform

Get started with Timefold quickstarts here. Optimize the vehicle routing problem, employee rostering, task assignment, maintenance scheduling and other planning problems.

Error tracking and logging from Javascript to Rollbar

🌈 Deterministic tints and shades from a given hex color.

Nextcloud Talk Desktop client

Multitenant backend server for building web and mobile apps rapidly. The backend for busy developers. (self-hosted or hosted)

Spring Cloud Zookeeper

Bangle.js App Loader (and Apps)

HTML reports for Cucumber

jMetal: a framework for multi-objective optimization with metaheuristics

Are you a beginner eager to enhance your React JS skills? Look no further! This repository is the perfect platform for you to dive into the world of React development and contribute to open source during Hacktoberfest. @Hacktoberfest @ReactJS

This library provides an Ant task and a Maven plugin to create Debian packages from Java builds in a truly cross platform manner.

A small Java 8 library (string manipulation, BiStream, Structured Concurrency, SQL Templates)

Hibernate Search: full-text search for domain model

World Generation through a new Iris

Gerrit Code Review Tool Integration for the IntelliJ Platform