ByeByeGenerator

This simple plugin allows the site administrator to customize the generator tag or remove it entirely. As of version 1.7 - also removes the generator tags from RSS and Atom feeds!

2.5+ users - you don't really need this plugin unless you're not comfortable editing your template index file. To do it in the template and save some system resources - just add this and Joomla will do the rest:
JFactory::getDocument->setGenerator(''); For newsfeeds - this plugin is still required!

If you're one of the many who think the generator tag is the last Joomla reference you need to remove, I'd like to direct you to my Clean Response plugin.

If you use Joomla Caching, be sure to place ByeByeGenerator before the "System - Cache" plugin in plugin ordering. This will ensure that cached pages also have the generator removed. The same thing goes for using the Jbetolo extension.

Version 1.10 resolves a PHP Strict Standards error - nothing serious.
Version 1.11 - added translations and prepared Joomla 3.x compatibility
Version 1.12 - added Joomla Update System functionality
Version 5.0.0 adds Joomla 5! native support - no backwards compatibility plugin required.

4/26/2012 - Joomla 1.5/1.6/1.7 availability and support withdrawn.