Java

pac4jpac4j/pac4j

A comprehensive security framework for Java applications, supporting authentication, authorization, and integration with multiple protocols and frameworks.

MultiSnapRecyclerViewTakuSemba/MultiSnapRecyclerView

An Android library for adding multiple snapping behavior to RecyclerView with customizable gravity and snap intervals.

archaiusNetflix/archaius

A Java configuration management library with dynamic property support, enabling runtime updates without application restarts.

RxRelayJakeWharton/RxRelay

RxJava types that are both an Observable and a Consumer, providing Subjects without terminal events.

Tapesquare/tape

A lightning-fast, transactional, file-based FIFO queue for Android and Java applications.

JeroMQzeromq/jeromq

Pure Java implementation of ZeroMQ for high-performance asynchronous messaging in distributed or concurrent applications.

Moquettemoquette-io/moquette

A lightweight Java MQTT broker compliant with MQTT 5 and 3, designed for embedding in other applications.

Confluent Schema registry for Kafkaconfluentinc/schema-registry

A RESTful service for storing, retrieving, and managing Avro, JSON Schema, and Protobuf schemas in Apache Kafka ecosystems.

Find Security Bugsfind-sec-bugs/find-sec-bugs

A SpotBugs plugin for detecting security vulnerabilities in Java web and Android applications.

RajawaliRajawali/Rajawali

A 3D engine for Android based on OpenGL ES 2.0/3.0, used for apps and live wallpapers.

Smackigniterealtime/Smack

A modular and portable open source XMPP client library written in Java for Android and Java SE VMs.

ta4jta4j/ta4j

A Java library for building, testing, and deploying automated trading strategies with 200+ technical indicators and production-ready tooling.

PeergosPeergos/Peergos

A peer-to-peer encrypted global filesystem and private web platform with secure file storage, social networking, and application hosting.

OpenTelemetryopen-telemetry/opentelemetry-java

The Java implementation of the OpenTelemetry API and SDK for recording and managing application telemetry.

shadow-cljsthheller/shadow-cljs

A comprehensive build tool and development environment for ClojureScript with seamless npm integration.

AnyChartAnyChart/AnyChart-Android

A comprehensive data visualization library for creating interactive charts in Android apps with dozens of built-in chart types.

Nordic Semiconductor BLE SDK for AndroidNordicSemiconductor/Android-BLE-Library

An Android library that solves common Bluetooth Low Energy problems, making BLE development easier and more reliable.

webcam-capturesarxos/webcam-capture

A Java library for accessing integrated or USB webcams with a simple API and support for multiple capture frameworks.

ModelMappermodelmapper/modelmapper

An intelligent Java library that automatically maps objects to each other using a convention-based approach.

Apache Sedonaapache/incubator-sedona

A cluster computing framework for processing large-scale geospatial data within Apache Spark, Flink, and other big data systems.

HAPI FHIRhapifhir/hapi-fhir

A comprehensive Java API for building HL7 FHIR clients and servers, enabling healthcare interoperability.

StreamExamaembo/streamex

A Java library that extends the Stream API with convenient methods, better interoperability, and enhanced performance.

Android cheat sheet: Coding program, Data structure, Android and Java interview questions with answers and categorized by topicsanitaa1990/Android-Cheat-sheet

A comprehensive collection of Android interview questions, coding problems, and solutions for technical interview preparation.

Prometheusprometheus/client_java

A Java instrumentation library for exposing application metrics to Prometheus monitoring systems.

Gobblinapache/incubator-gobblin

A distributed data integration framework for big data ecosystems, handling ingestion, replication, organization, and lifecycle management for both streaming and batch data.

Amidsttoolbox4minecraft/amidst

A tool to display an overview of a Minecraft world from a seed or save game without generating the world.

Gobblin from LinkedInlinkedin/gobblin

A distributed data integration framework for big data ecosystems, handling ingestion, replication, organization, and lifecycle management for both streaming and batch data.

p6spyp6spy/p6spy

A Java framework that intercepts and logs database JDBC transactions without requiring code changes.

flyingsaucerflyingsaucerproject/flyingsaucer

A pure-Java library for rendering XML/XHTML with CSS 2.1 to Swing, PDF, and images.

Universal-G-Code-Senderwinder/Universal-G-Code-Sender

A cross-platform Java application for sending G-Code to CNC controllers like GRBL, Smoothieware, TinyG, and g2core.

EVCacheNetflix/EVCache

A distributed in-memory data store for the cloud, built on memcached and optimized for AWS EC2 infrastructure.

Plantumlplantuml/plantuml-server

A web application that generates UML diagrams from text descriptions on-the-fly.

MarquezMarquezProject/marquez

An open-source metadata service for collecting, aggregating, and visualizing data lineage and ecosystem metadata.

Freeciv-webfreeciv/freeciv-web

An open-source turn-based strategy civilization-building game playable in HTML5 and WebGL browsers.

summingbirdtwitter/summingbird

A library for writing MapReduce programs that execute on distributed platforms like Storm and Scalding using Scala/Java collection-like syntax.

LittleProxyadamfisk/LittleProxy

A high-performance HTTP proxy library for Java, built on Netty, designed for embedding and traffic manipulation.