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

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

AI + Data, online. https://vespa.ai

Project Wycheproof tests crypto libraries against known attacks.

A Java package to automatically detect anomalies in large scale time-series data

A CONIKS implementation in Java