Cobian Backup Portable PORTABLE APPS: File and directory backup utility
FileZillaPortable PORTABLE APPS: Portable FTP Client
i.Scribe PORTABLE APPS: Portable Email Client and calendar
IZArc2Go PORTABLE APPS: Zip-Unzip archive tool
Kolorgenerator PORTABLE APPS: Color tool
KompozerPortable PORTABLE APPS: Portable WYSIWYG Web page authoring tool
OpenOfficePortable PORTABLE APPS: Portable Office Suite
OperaUSB PORTABLE APPS: Portable Web Browser
SunbirdPortable PORTABLE APPS: Portable calendar utility
The Gimp Portable PORTABLE APPS: Portable Graphics Editor: Photo-paint
UltraShredder PORTABLE APPS: Portable File Shredder
VLC Portable PORTABLE APPS: Portable Media Player
(Note: for a comprehensive, categorized list see http://portablefreeware.com/)