I've gotten so much use out of the caulking Swiss army knife in a very short period of time.
It has swappable vinyl/plastic tips for smoothing the caulk which are fantastic and easy to clean. The straight razor blade allows scraping or cutting, while the other end cuts out existing caulking.
There is a puncture tool for opening the tune and an angled razor blade for cutting tube tips.
It's such a well designed, lightweight little tool that provides to much value.