Free Portable Software (for USB thumbdrive) 
From PortableApps.com: "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 thumbdrive, 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, none of your personal data is left behind."
Let's gather all of the portable software on the Net. Make sure it is free.
Resources
"A portable version of the popular Mozilla Thundebird email client."
The complete OpenOffice.org office suite but portable.
"A free reader for PDF (Portable Document Format) documents. You can view and print PDF documents with it."
Portable Apps Suite™ is a collection of portable apps including a web browser, email client, web editor, office suite, word processor, calendar/scheduler, instant messaging client and FTP client, all preconfigured to work portably and be easy to back up. Just drop it on your portable device and you're ready to go.
Most of the features present in other BitTorrent clients are present in µTorrent, including bandwidth prioritization, scheduling, RSS auto-downloading and Mainline DHT.
PStart is a tray tool to start portable applications.
Portable IM to chat on AOL, Yahoo!, MSN and more at the same time.
"portaPuTTY is a hacked version of PuTTY that stores all its information in files, not in the registry. I made this version so I could have a good SSH client to run from a USB drive."
Portable ftp client that is easy to use and reliable.
"UltraVNC is an easy to use, fast and free, opensource sotware that can display the screen of another computer (via internet or network) on your own screen. The program allows you to use your mouse and keyboard to control the other PC remotely. It means that you can work on a remote computer, as if you were sitting in front of it, right from your current location."
A nice open source password storage tool that keeps passwords in an encrypted file. Can autofill in web forms and allows copying and pasting of the password securely. Can autogenerate passwords and show how secure a password is.
USB office package which contains an encryption program, a zip utility, an FTP client, a multiple document interface Rich Text editor, a notepad-style editor, secure file shredder, full POP email client, web server for hosting files via http, a mini tree-style outliner, vector graphics editor, a spreadsheet program compatible with Microsoft Excel, and a PDF creator.
Burrrn is a little tool for creating audio CDs with CD-Text from various audio files. Supported formats are: wav, mp3, mpc, ogg, aac, mp4, ape, flac, ofr, wv, tta, m3u, pls and fpl playlists and cue sheets. You can also burn EAC’s noncompliant image + cue sheets! Burrrn can read all types of tags from all these formats (including ape tags in mp3).
A small, essential and easy to use mp3 cutter. Good for mp3 player/USB Drive like iPod Shuffle. I use it to cut long Podcast.
VLC is a mediaplayer that plays everything except realmedia files.
This is a DOS port of the UNIX Lynx browser. It is fast, and will work from a USB drive, if you configure it properly. Hey! You're mostly just reading from the 'net anyways! Think of it as a smart Gopher (Yes, I'm old).
Encryption utility that uses various cryptographic algorithms to encrypt and decrypt textual files. These algorithms include: Blowfish, Cast128, Gost, IDEA, Misty1, AES/Rijndael, and Twofish. Omziff also generates random passwords, splits files, and does simple file shredding according to DOD Standards. It is freeware, comes in a standalone executable file with no dependencies and is completely USB compatible!
If you have a mole suspect for skin cancer, a surgical excision may be required or recommended as a precautionary measure and you may have to visit a mole removal clinic such as The Mole Clinic.
EMC Advertising Gifts supply customised and personalised promotional products, promotional gifts, promotional items, corporate gifts and promotional merchandise.
Design firm produces web sites designed to grow your business.
A flowchart is a schematic representation of a process.
NetSafeGuard is a pioneering next generation antivirus software solution, delivering advanced preventative protection using artificial intelligence to build a proactive self-evolving security system.
Just install the program on your computer and copy the program folder onto your thumb drive. I have tested it, and it scans perfectly for me...even without it being installed on the host computer.
So much more convenient then having to buy and install Nero and just about as powerful. The trail version is almost fully functional (except the CD cover creator).
A43 File Management Utility is a standalone file manager with built-in zip compression and text editing.
offers workshops in the fine art of decorative painting.
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This is the free version of Sketchup Pro (which costs about USD 500). Quoting from the website:
"SketchUp is a deceptively simple, amazingly powerful tool for creating, viewing, and modifying 3D ideas quickly and easily."
The drawing tools are not as precise and technical as those in other design software (like Anim8or), but they are much more intuitive. It is not featured as a "Portable" software, but you can copy the installed folder to a Flash drive and it will work just fine.
SyncBack is a backup program that can run from a Flash drive. The free version lacks features that are in the "SE" version. I use it to keep files in agreement between Flash drive, desktop computer and network storage.
Quoting from their page:
"SyncBack is our multi-award winning freeware program that helps you easily backup and synchronise your files to: the same drive; a different drive or medium (CDRW, CompactFlash, etc); an FTP server; a Network; or a Zip archive."
If you keep documents on your Flash drive, you'll want to have them sync with your hard drive as well.
Create 3-D objects, articulated figures, movement sequences and animated scenes. Render to .avi movies. After installation, the program folder is self-contained, and can be saved to a thumbdrive.
Pepakura Designer allows you to create a paper craft model easily from 3D data (e.g. .3DS file) to cut out and paste together. After installation, the program folder is self-contained, and can be saved to a thumbdrive.
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Captures screenshots and composes an interactive Flash animation from them. Useful for creating software tutorials. After installation, the program folder is self-contained, and can be saved to a thumbdrive.
I'm concerned that some of the software at portableapps.com, such as PortableThunderbird, hasn't been updated to the latest version for quite some time.