Canadian Restricted Firearms Safety Course/PAL/RPAL Preparation Quiz. 250+ questions.

DVSA / DSA Question Bank 2015 for Driving Theory Test for Car Drivers.

Automatic device for measuring voice parameters, noise and music.
It should be noted that even though this device allows you to measure the parameters of voices (and hidden emotions), it is not a conventional polygraph. It is a universal measuring instrument, which is designed for a variety of scientific experiments.

Finally, a game first approach to math that is not just a boring flash card app!