Netty project - an event-driven asynchronous network application framework
Networking framework for .net
Event-driven, non-blocking I/O with PHP
A component-based, event-driven JavaScript framework from Twitter
Event-driven OS kernel built on V8 JavaScript engine
The sorta-official libevhtp chat.
Library for using a readable blocking-like syntax with event-driven Javascript code
Bring your Backbone applications to life with an event-driven Command framework.
MeteorCode Pathway - an open-source event-driven game engine for the JVM
Event-driven HTML5 Parser in Javascript