Σύνδεσμος php.net

The language that Joomla! is developed in

Σύνδεσμος MySQL

The most commonly used database for Joomla!.

Σύνδεσμος Ohloh Tracking of Joomla!

Objective reports from Ohloh about Joomla's development activity. Joomla! has some star developers with serious kudos.