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

Netty project - an event-driven asynchronous network application framework

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

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

An Android library for managing images and the memory they use.

A Java API for generating .java source files.

A damn simple library for building production-ready RESTful web services.

Open source routing engine for OpenStreetMap. Use it as Java library or standalone web server.

A Java to iOS Objective-C translation tool and runtime.

Your go-to microservice framework for any situation, from the creator of Netty et al. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, R…

Java regular expressions made easy.

jsprit is a java based, open source toolkit for solving rich vehicle routing problems

Implementation of GeoHashes in java. We try to be/stay compliant to the spec, as far as possible.

Mirror of Apache Cassandra (incubating)

Network service to provide globally strictly monotone increasing timestamp

Themis provides cross-row/cross-table transaction on HBase based on google's percolator.

Haeinsa is linearly scalable multi-row, multi-table transaction library for HBase

Concurrent TreeMap w/ efficient support for clone() and consistent iteration