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>_bryanallott.net

Gratis

This is the useful shortlist (by no means comprehensive) of all the free or open source software i have experience in either using, installing, supporting or extending; and more; i would recommend you try.
Operating Systems
Ubuntu (along with the various distribution flavours, both server and desktop)
Get Ubuntu  
Development Tools & Technologies
Visual Studio Express
SharpDevelop
Eclipse
MonoRails (along with ActiveRecord)
Ruby on Rails
Aptana
AppEngine
 
Web Applications
Wordpress (including MU Edition)
Joomla
Drupal
MediaWiki
Moodle
Elgg
 
Productivity Applications
Open Office (MS Office Replacement)
The Gimp
Mozilla Thunderbird (email)
Timesheet (home rolled timesheet web app)
Google Calendar