This stuff can be installed on any portable drive, i.e. USB thumbdrive, PDA or an iPod. You can use them at work, school, or any other place where you can plugin your device. Check them out, you can either scroll-down for relevant category, i.e office software, email tools, messengers, games, etc. or get a ‘all-in-one’ package (all essential tools) . While there are more apps for windows users, I tried to include a mac version for each essential tool. All free. Enjoy!
bear: this is really useful!