Nio

The PHP Multiplexed I/O library is an object oriented PHP5 library for managing multiplexed (or non-blocking) I/O. It is loosely based on the selectable channels nonblocking IO implementation from Java's NIO package. Platforms: Windows, Mac, Linux

UberMQ is a clean-room implementation of the JMS 1.1 API (topics and queues), based on Java NIO for speed and scalability. It supports TCP, SSL and LRMP multicast connectivity, and is highly pluggable so you can customize various aspects to your needs. Platforms: *nix

Dynagen is a front-end for use with the Dynamips Cisco router emulator. It uses an INI-like configuration file to provision Dynamips emulator networks. It takes care of specifying the right port adapters, generating and matching up those pesky NIO descriptors, specifying bridges, frame-relay, ATM... Platforms: Mac

Niocchi is a java asynchronous crawl library implemented with NIO. It is designed to crawl several thousands of hosts in parallel on a single low end server. It is currently being used in production by Enormo to crawl thousands of websites daily, and by Vitalprix. Platforms: Mac

Apache ActiveMQ is the most popular and powerful open source messaging and Integration Patterns provider. Apache ActiveMQ is fast, supports many Cross Language Clients and Protocols, comes with easy to use Enterprise Integration Patterns and many advanced features while fully supporting JMS 1.1... Platforms: Mac