Java

ImageJimagej/ImageJ

Public domain Java software for processing and analyzing scientific images across multiple platforms.

react-native-background-uploadVydia/react-native-background-upload

Upload files in React Native apps with background support for both Android and iOS, including camera roll assets.

DBPedia Spotlightdbpedia-spotlight/dbpedia-spotlight

A tool for automatically annotating mentions of DBpedia resources in text, linking entities to their global identifiers.

RESTMockandrzejchm/RESTMock

A library for mocking HTTP responses in Android instrumentation tests using Hamcrest matchers.

Figarop2t2/figaro

A probabilistic programming language built on Scala for creating rich probabilistic models and performing automated reasoning.

Encogencog/encog-java-core

A pure-Java/C# machine learning framework for neural networks, genetic programming, and classic ML algorithms with simple adaptable source code.

Serenity BDDserenity-bdd/serenity-core

A Java library for writing cleaner automated acceptance tests with rich living documentation and integration with Selenium, Playwright, and BDD tools.

Clarityskadistats/clarity

A high-performance Java parser for Dota 2, CSGO, CS2, and Deadlock replay files.

TensorFramestjhunter/tensorframes

TensorFlow binding for Apache Spark DataFrames, enabling TensorFlow program execution on Spark data.

jFairyDevskiller/jfairy

A Java library for generating realistic fake data like persons, companies, and emails with locale support.

NuProcessbrettwooldridge/NuProcess

A low-overhead, non-blocking I/O external Process implementation for Java, replacing java.lang.ProcessBuilder and Process.

Arduino FS Pluginesp8266/arduino-esp8266fs-plugin

Arduino IDE plugin for uploading files to the ESP8266's SPIFFS flash file system.

clojure.java.jdbcclojure/java.jdbc

A low-level Clojure wrapper for JDBC-based database access, now superseded by next.jdbc.

yadajuxt/yada

A powerful Clojure web library for building production HTTP services with full standards support and async capabilities.

Mongo-Sparkmongodb/mongo-spark

Official connector for integrating Apache Spark with MongoDB, enabling distributed data processing on MongoDB data.

Apache StreamPipesapache/incubator-streampipes

A self-service IoT toolbox enabling non-technical users to connect, analyze, and explore industrial IoT data streams.

Jerseyeclipse-ee4j/jersey

A REST framework providing the JAX-RS Reference Implementation with additional APIs and extension SPIs for Java-based web services.

Datadog cDataDog/dd-trace-java

Datadog's APM client library for Java, enabling distributed tracing, profiling, and monitoring.

compile-testinggoogle/compile-testing

A Java library for testing javac compilation and annotation processors in unit tests.

one-nioodnoklassniki/one-nio

A high-performance I/O library for Java servers, exposing OS capabilities and JDK internals for maximum throughput.

QBitadvantageous/qbit

A reactive Java library for building high-performance microservices with REST, JSON, and WebSocket support.

Jade4Jneuland/jade4j

A Java implementation of the Pug template engine that processes templates without requiring JavaScript.

Spring for Android - Rest Templatespring-projects/spring-android

A library providing Spring's RestTemplate and authentication support for building REST clients in native Android applications.

jHiccupgiltene/jHiccup

A non-intrusive instrumentation tool that logs and records JVM stalls and platform hiccups in Java applications.

Texture Packer GUIcrashinvaders/gdx-texture-packer-gui

A visual GUI tool for packing and managing texture atlases for the libGDX game framework.

FenzoNetflix/Fenzo

A Java library for Apache Mesos frameworks that provides extensible task scheduling with optimization plugins and cluster autoscaling.

JSLT ()schibsted/jslt

A complete query and transformation language for JSON, inspired by jq, XPath, and XQuery.

jammjbellis/jamm

A Java agent and library for measuring actual object memory usage, including JVM overhead, across multiple Java versions.

android-yolonatanielruiz/android-yolo

Real-time object detection on Android using YOLO with TensorFlow, detecting 20 object classes from the Pascal VOC dataset.

barefootbmwcarit/barefoot

A Java library for state-of-the-art online and offline map matching using OpenStreetMap, designed for scalable location-based services.

StartupOSgoogle/startup-os

A collection of working examples demonstrating Google's open-source technology stack for cloud-native development.

Stendhalarianne/stendhal

A free, open-source multiplayer online adventure game (MORPG) with an old-school feel, featuring exploration, quests, and character progression.

JGraphXjgraph/jgraphx

A Java Swing library for visualizing and interacting with node-edge graphs, diagrams, and network visualizations.

Artipieartipie/artipie

An open-source, horizontally scalable binary artifact management tool supporting Maven, Docker, npm, and more.

Active Directory Control PathsANSSI-FR/AD-control-paths

A tool for auditing and visualizing control paths in Active Directory to identify privilege escalation and resource access risks.

FastCSVosiegmar/FastCSV

A fast, lightweight, and RFC 4180 compliant CSV library for Java with zero dependencies and a ~90 KiB footprint.