Java

jOOLjOOQ/jOOL

jOOλ extends Java 8 with missing functional programming features: tuples, higher-arity functions, and enhanced sequential streams.

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.

Speedmentspeedment/speedment

A Java Stream ORM toolkit that generates type-safe code from SQL databases, enabling database queries using standard Java Streams.

Vineflowervineflower/vineflower

A modern Java and JVM language decompiler focused on high-quality, clean, and accurate code output.

Logbookzalando/logbook

An extensible Java library for complete HTTP request and response logging across various client and server technologies.

Intro-To-RxJavaFroussios/Intro-To-RxJava

A comprehensive beginner-to-advanced tutorial for learning reactive programming with RxJava on the JVM.

Rubotoruboto/ruboto

A platform for developing Android applications using the JRuby Ruby implementation.

Google Cloud Client Librariesgoogleapis/google-cloud-java

Java idiomatic client libraries for interacting with Google Cloud Platform services.

Tabulatabulapdf/tabula-java

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

AppUpdaterjaviersantos/AppUpdater

An Android library that checks for app updates from Google Play, GitHub, Amazon, F-Droid, or custom servers.

zfoozfoo-project/zfoo

An extremely fast, asynchronous, actor-based enterprise server framework for RPC, game servers, and web servers.

Elasticsearch Hadoopelastic/elasticsearch-hadoop

Native integration library for using Elasticsearch with Hadoop, Spark, and Hive for real-time search and analytics on big data.

AndroidFillableLoadersJorgeCastilloPrz/AndroidFillableLoaders

Android library for creating animated fillable progress views and branding logos using SVG paths.

Polishzlw/poli

An easy-to-use, self-hosted SQL reporting application for creating interactive business intelligence dashboards.

Javapengrad/java-telegram-bot-api

A comprehensive Java library for building Telegram bots with full support for the latest Bot API features.

DataStax Spark Cassandra Connectordatastax/spark-cassandra-connector

A connector that enables Apache Spark to read from and write to Apache Cassandra databases for distributed data processing.

Ratpackratpack/ratpack

A simple, capable toolkit for creating high-performance HTTP applications on the JVM.

AndrOBDfr3ts0n/AndrOBD

An open-source Android app for OBD-II vehicle diagnostics using any ELM327 adapter.

Apache ServiceComb Java Chassisapache/servicecomb-java-chassis

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

Usb serial controller for AndroidfelHR85/UsbSerial

Android library for USB serial communication with support for multiple chipset families and SPI interface.

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.

Selenideselenide/selenide

A concise Java UI testing framework built on Selenium WebDriver for easy-to-read and maintainable automated tests.

Selenidecodeborne/selenide

A Java framework for writing concise, readable, and maintainable UI tests using Selenium WebDriver.

lwjgl: Shadersmattdesl/lwjgl-basics

A minimal shader-based library for 2D LWJGL sprite games, providing utilities for textures, shaders, and rendering.

OpenGL & GLSL Tutorialsmattdesl/lwjgl-basics

A minimal shader-based library for 2D LWJGL sprite games, providing utilities for textures, shaders, and rendering.

Bridafedericodotta/Brida

A Burp Suite extension that bridges to Frida, enabling dynamic analysis and manipulation of mobile app traffic using the app's own code.

libsignal-protocol-javasignalapp/libsignal-protocol-java

A Java implementation of the Signal Protocol for end-to-end encrypted messaging with forward secrecy and asynchronous support.

KryoNetEsotericSoftware/kryonet

A Java library for efficient TCP/UDP client-server network communication using NIO and Kryo serialization.

Codename Onecodenameone/CodenameOne

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

ParparVMcodenameone/CodenameOne

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

gs-collectionsgoldmansachs/gs-collections

A Java collections framework with rich APIs, optimized implementations, and additional container types like Bag and Multimap.

Datahikereplikativ/datahike

A durable Datalog database with Datomic-compatible APIs, immutable snapshots, and distributed architecture.