The Victorinox Voyager Swiss Army knife is a great tool for travellers. It includes a versatile set of useful tools, plus a digital alarm clock-- all in a pocket knife that is conveniently compact.

This model has been retired by Victorinox, although the Voyager Lite is still in production.

Altimeter-- replaces digital clock with an altimeter
Explorer Plus-- no clock, adds magnifier and phillips screwdriver
Timekeeper Alarm-- replaces corkscrew with phillips screwdriver, no hook or pen
Voyager Lite-- adds phillips screwdriver and white LED light