Implementations: Libraries, frameworks and tools that use Event-Driven Programming paradigm.
Flight: An event-driven web framework, from Twitter.
Mediator.js: Mediator is a simple class that allows you to register, unregister, and call subscriber methods to help event-based, asyncronous programming.
Postal.js: Postal.js takes the familiar "eventing-style" paradigm and extends it by providing "broker" and subscriber implementations
pubsub.js: A tiny (~600 bytes when minified, ~300 bytes when gzip'd) and robust pubsub implementation.