Portable Firefox 1.5 
http://portableapps.com/apps/internet/browsers/portable_firefox

Portable AbiWord 2.42
http://portableapps.com/apps/office/word_processors/portable_abiword

Foxit PDFReader
http://www.foxitsoftware.com/

Filezilla FTP Software 2.2.18
http://filezilla.sourceforge.net/

SilentNight Micro CD/DVD/ISO Burner
http://silentnight2004.com/Download.html

VLC Media Player
http://www.videolan.org/vlc/

FastStone Image Viewer
http://www.faststone.org/

Rename Master 2.7.2
http://fileforum.betanews.com/detail/Rename_Master/1050495974/1

IrfanView 3.98
http://www.irfanview.com/