Free and Open Source, Distributed, RESTful Search Engine

Spring Framework

Google core libraries for Java

RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

The java implementation of Apache Dubbo. An RPC and microservice framework.

Getting Started with Spring Boot 3:

An image loading and caching library for Android focused on smooth scrolling

Netty project - an event-driven asynchronous network application framework

ZXing ("Zebra Crossing") barcode scanning library for Java, Android

an easy-to-use dynamic service discovery, configuration and service management platform for building cloud native applications.

Telegram for Android source

🔥 Seata is an easy-to-use, high-performance, open source distributed transaction solution.

Open Source Identity and Access Management For Modern Applications and Services

Apache Flink

Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex di…

APM, Application Performance Monitoring System

a fast, scalable, multi-language and extensible build system

Redisson - Valkey and Redis Java client. Complete Real-Time Data Platform. Sync/Async/RxJava/Reactive API. Over 50 Valkey and Redis based Java objects and services: Set, Multimap, SortedSet, Map, L…

Jenkins automation server

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

This project is deprecated and stale. The latest ExoPlayer code is available in https://github.com/androidx/media

GraalVM compiles Java applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀

IntelliJ IDEA Community Edition & IntelliJ Platform

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.

A high performance caching library for Java

Apache Pulsar - distributed pub-sub messaging system

Logstash - transport and process your logs, events, or other data

Quarkus: Supersonic Subatomic Java.

🏗 Build container images for your Java applications.

Open source alternative to Auth0 / Firebase Auth / AWS Cognito