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87 stars written in Java
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JDK main-line development https://openjdk.org/projects/jdk

Java 22,715 6,295 Updated Mar 30, 2026

IntelliJ IDEA & IntelliJ Platform

Java 19,884 5,709 Updated Mar 30, 2026

A high performance caching library for Java

Java 17,576 1,682 Updated Mar 30, 2026

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

Java 14,658 2,100 Updated Mar 30, 2026

jsoup: the Java HTML parser, built for HTML editing, cleaning, scraping, and XSS safety.

Java 11,361 2,281 Updated Mar 24, 2026

A barebones WebSocket client and server implementation written in 100% Java.

Java 10,797 2,589 Updated Jan 13, 2026

Java JsonPath implementation

Java 9,393 1,711 Updated Feb 22, 2026

Test Automation Made Simple

Java 8,821 2,023 Updated Mar 28, 2026

Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

Java 8,615 1,816 Updated Mar 30, 2026

Tiny, easily embeddable HTTP server in Java.

Java 7,212 1,726 Updated Jul 25, 2023

Reactive Streams Specification for the JVM

Java 4,872 532 Updated Mar 13, 2024

A reference implementation of a JSON package in Java.

Java 4,717 2,593 Updated Mar 26, 2026

Fibers, Channels and Actors for the JVM

Java 4,564 567 Updated Jan 21, 2024

Google Go language IDE built using the IntelliJ Platform

Java 4,540 566 Updated Aug 11, 2018

Eclipse Jetty® - Web Container & Clients - supports HTTP/3, HTTP/2, HTTP/1, websocket, servlets, and more

Java 4,067 1,990 Updated Mar 30, 2026

XChange is a Java library providing a streamlined API for interacting with 60+ Bitcoin and Altcoin exchanges providing a consistent interface for trading and accessing market data.

Java 4,050 2,007 Updated Feb 26, 2026

High performance non-blocking webserver

Java 3,742 1,056 Updated Mar 24, 2026

An in-memory file system for Java

Java 2,535 285 Updated Mar 9, 2026

OpenTelemetry Java SDK

Java 2,376 957 Updated Mar 30, 2026

Open-source plugins included in the distribution of IntelliJ IDEA Ultimate and other IDEs based on the IntelliJ Platform

Java 2,254 1,049 Updated Mar 30, 2026

An HTML to PDF library for the JVM. Based on Flying Saucer and Apache PDF-BOX 2. With SVG image support. Now also with accessible PDF support (WCAG, Section 508, PDF/UA)!

Java 2,138 405 Updated Jun 14, 2024

fastutil extends the Java™ Collections Framework by providing type-specific maps, sets, lists and queues.

Java 2,120 221 Updated Dec 2, 2025

Cross-platform static analyzer and linter for Swift.

Java 1,407 49 Updated Feb 27, 2021

Rich-text area for JavaFX

Java 1,326 240 Updated Dec 23, 2025

Transactional schema-less embedded database used by JetBrains YouTrack and JetBrains Hub.

Java 1,254 115 Updated Dec 1, 2025

Jansi is a small java library that allows you to use ANSI escape sequences to format your console output which works even on windows.

Java 1,191 153 Updated Mar 27, 2026

Java Template Engine

Java 1,183 175 Updated Mar 26, 2026

LZ4 compression for Java

Java 1,175 284 Updated Nov 28, 2025

Secure and speedy templates for Java and Kotlin.

Java 1,097 85 Updated Mar 30, 2026

Multifunctional java deobfuscation tool suite

Java 970 134 Updated Apr 22, 2023
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