event_dispatcher gem provides a simple observer implementation, allowing you to subscribe and listen for events in your application in a simple and effective way. It is very strongly inspired by the Symfony EventDispatcher component

Generic Event Dispatcher. Provide simple event dispatcher mechanism for all of ruby products.

A lightweight and simple Ruby Event System inspired on Symfony Event Dispatcher.

Observatory is a simple gem to facilitate loosely-coupled communication between Ruby objects. It implements the observer design pattern so that your objects can publish events that other objects can subscribe to. Observatory provides some syntactic sugar and methods to notify events, filter value...