The apps on this list can help you with everything from coding to graphics to running your business and managing your projects, all from a single USB drive. And while USB drives are getting bigger all the time (last I checked a 64GB one wasn’t too badly priced, and that’s 4GB more storage than my current MacBook has), you still need special programs in most instances to have true portability. The apps below are just that: truly portable and small enough to fit on a USB drive (often a very small USB drive).