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

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

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

IOTA Reference Implementation

Background services and web workers for react-native

The implementation of the Rascal meta-programming language (including interpreter, type checker, parser generator, compiler and JVM based run-time system)

A fast and efficient (QR) barcode scanner for Capacitor

The original unit-testing framework for JavaScript. These days we use Jasmine (http://github.com/pivotal/jasmine) by default for JS testing; JsUnit is not actively developed or supported.

Enhanced version of JSSpec with interactive features