Windows only: Thumb drive application packages like the Portable Apps Suite are great for taking your full-featured programs wherever you go, but those with smaller drives or working on slower computers might feel overwhelmed. Enter Floppy Office, a package smaller than 2 MB that contains a rich text editor, POP/IMAP email client, PDF creator, spreadsheet program and 10 more applications. All of them get the job done with minimal overhead, and most can be run without installation. Floppy Office is a free download that runs on Windows systems only. For more useful to-go tools, check out must-have portable apps.