Free and Open Source, Distributed, RESTful Search Engine

All Algorithms implemented in Java

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.

Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas

Netty project - an event-driven asynchronous network application framework

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

Apollo is a reliable configuration management system suitable for microservice configuration management scenarios.

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…

A Java serialization/deserialization library to convert Java Objects into JSON and back

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

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

光 HikariCP・A solid, high-performance, JDBC connection pool at last.

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

Tinker is a hot-fix solution library for Android, it supports dex, library and resources update without reinstall apk.

Most popular Mocking framework for unit tests written in Java

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

🏗 Build container images for your Java applications.

APM, (Application Performance Management) tool for large-scale distributed systems.

Guice (pronounced 'juice') is a lightweight dependency injection framework for Java 11 and above, brought to you by Google.

The Java gRPC implementation. HTTP/2 based RPC

A collection of source code generators for Java.

Resilience4j is a fault tolerance library designed for Java8 and functional programming

A simple expressive web framework for java. Spark has a kotlin DSL https://github.com/perwendel/spark-kotlin

Server supporting the Signal Private Messenger applications on Android, Desktop, and iOS

Java Native Access

A programmer-oriented testing framework for Java.

GoCD - Continuous Delivery server main repository

Tiny, easily embeddable HTTP server in Java.

A Flexible and Powerful Parameter Server for large-scale machine learning