Programming

ActivePerl - http://www.activestate.com/Products/ActivePerl

Dev C++ - http://www.bloodshed.net/

Dev Pascal - http://www.bloodshed.net/

Eclipse - http://www.eclipse.org/

Freepascal - http://www.freepascal.org/

jEdit - http://www.jedit.org/

PHP Hypertext Parser - http://www.php.net/

Python - http://www.python.org/

Ruby - http://www.dm4lab.to/~usa/ruby/index_en.html

SharpDevelop - http://www.icsharpcode.net/opensource/sd/