What is a portable app? http://portableapps.com/
portable - carried or moved with ease
app - a computer program like a web browser or word processor
A portable app is a computer program that you can carry around with you on a portable device and use on any Windows computer. When your USB flash drive, portable hard drive, iPod or other portable device is plugged in, you have access to your software and personal data just as you would on your own PC. And when you unplug the device, none of your personal data is left behind.
No Special Hardware - Use any USB flash drive, portable hard drive, iPod/MP3 player, etc
No Additional Software - Just download the portable app, extract it and go
No Kidding - It's that easy
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
it has the following apps:
Applications
Development
* Nvu Portable - The easy-to-use Nvu web editor
* XAMPP - Apache, mySQL, PHP, phpMyAdmin and more in an integrated package
Games
* Sudoku Portable - the wildly popular and addictive puzzle game
Graphics & Pictures
* GIMP Portable - Photo and Image Editor
Internet
* FileZilla Portable - the full-featured FTP client
* FireFTP Extension (for Firefox) - a lightweight extension
* Gaim Portable - chat with AOL, MSN and Yahoo users in an easy-to-use interface
* Miranda IM Portable - chat with AOL, MSN and Yahoo users in a customizable interface
* Mozilla Firefox - Portable Edition - the award-winning web browser that's safe and secure
* Mozilla Thunderbird - Portable Edition - the handy email client
* Sage Extension (for Firefox) - A full-featured RSS extension
* Nvu Portable - the easy-to-use webpage editor
Music & Video
* Audacity Portable - A simple audio editor and recorder
* VLC Media Player Portable - An easy to use media player that plays most audio and video formats
Office
* AbiWord Portable - a lightweight word processor compatible with Microsoft Word files
* Lightning Extension (for Thunderbird) - A lightweight extension for your calendar and tasks
* Mozilla Sunbird - Portable Edition - Calendar and task management with a familiar interface
* Mozilla Thunderbird - Portable Edition (Address Book) - Email client's built-in address book with import/export functions
* OpenOffice.org Portable - word processor, spreadsheet, presentations with Microsoft compatibility
Operating Systems
* Mac-on-Stick - Run Mac OS Classic 7 portably
Utilities
* 7-Zip Portable - File archiver and compressor
* ClamWin Portable - Antivirus on the go
* PortableApps Backup - An easy-to-use backup utility
* PortableApps Menu - An easy-to-use system tray launcher