26 Reasons to Love Open-Source Software
- OpenSolaris
- Ubuntu
- Apache HTTP Server
- Apache Tomcat
- Apache Roller
- WordPress
- MySQL
- WAMP
- WinSCP
- FileZilla
- Ghostscript and GSView
- PuTTY
- Mozilla Firefox
- Thunderbird
- OpenOffice.org
- Perl
- Java
- PHP
- Drupal
- Joomla!
- GNU emacs
- XEmacs
- gcc
- bugzilla
- gftp
- 7-zip
A great resource for replacing proprietary applications with open-source is Open Source Alternatives
