WinZip: www.winzip.com
Stuffit Expander: www.aladdinsys.com

Quicktime: www.apple.com/quicktime/
RealPlayer: www.real.com
Windows Media Player: www.micosoft.com/windows/windowsmedia/

WinAmp: www.winamp.com
SoundApp: www-csstudents.stanford.edu/~franke/SoundApp/

Adobe Acrobat Reader: http://www.adobe.com/products/acrobat/