Free GPL Joomla! extensions

The following Joomla! extensions are released under GPL.

RSFirewall - Joomla security Joomla 1.5 Download
Security extension for Joomla! 1.5
Joomla admin Joomla 1.5 Download
Joomla! 1.5 module for admin quick access
Joomla seo Joomla 1.5 Download
Search engine optimization suite for Joomla! 1.5