Swiss Army Knife is a toolbox which contains a set of tiny tools. These tools are flashlight, ruler, timer, stop watch, compass, bubble level, calculator, magnifying glass (Android 2.2+ required) and a mirror (Android 2.3+ and front camera required).
The application designed for to be lightweight, fast and easy to use. Because of that, every tool makes what it is supposed to do without special 3D effects. Being compact has advantage to save a lot of disk space too.
Great side of the app is requiring no network access, the permission to write on your flash memory or the permission to read your contacts. By the way, you will save network consumption and have an secure app.