Blackbird – Open Source Javascript Logging Utility

Blackbird offers a dead-simple way to log messages in JavaScript and an attractive console to view and filter them. You might never use alert() again. You can add Blackbird to your page easily, simply download the files and place them on your server or in a local directory on your computer.

Website: http://www.gscottolson.com/blackbirdjs/

Download and View Examples