Top JAVA GitHub Repositories & Tools (2026)

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

A tool for mocking HTTP services

Catch common Java mistakes as compile-time errors

A free, online learning platform to make quality education accessible for all.

Find and fix problems in your JavaScript code.

Input Mask plugin

Micronaut Application Framework

Apache IoTDB

Asynchronous, non-blocking HTTP & WebSocket client for the JVM

Apache Pinot - A realtime distributed OLAP datastore

Apache Hive

JSqlParser parses an SQL statement and translate it into a hierarchy of Java classes. The generated hierarchy can be navigated using the Visitor Pattern

Zammad is a web based open source helpdesk/customer support system.

Redis Java client

jQuery Form Plugin

MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.

Integration with Netflix OSS components

Ruby ♥︎ JavaScript

A self-hosted library for your ebooks, comics, and audiobooks

:date: Easy!Appointments - Self Hosted Appointment Scheduler