Apache Log4j 2 is a versatile, feature-rich, efficient logging API
Advanced Java Redis client for thread-safe sync, async, etc.
Nginx module for embedding Clojure or Java or Groovy programs
HL7 Inspector is a tool for managing HL7 messages
Java actor library
A simple, non-blocking, NIO-based, TCP socket API for Java
A simple socket debugging tool for Android devices.