As you can see, I am on the quest to find open source software.
Scribus - Desktop publishing (Have to download Ghostscript first)
http://www.scribus.net/
http://www.scribus.net/
Avast (Not exactly open source - just free) - Virus scan
http://www.avast.com
Primopdf (Not exactly open source - just free) - PDF converter
www.primopdf.com
Primopdf (Not exactly open source - just free) - PDF converter
www.primopdf.com
Greenshot - Capture Screen
getgreenshot.org
Ghostscript
http://sourceforge.net/projects/ghostscript/files/GPL%20Ghostscript/8.71/For more software go to
http://www.gnu.org/software/for-windows.html
http://directory.fsf.org/
You can choose your platform in sourceforge or just go to this link
http://sourceforge.net/search/?&platform[]=Windows