Hopefully you'll find at least one of these interesting or useful!
Sonic Boom Simulator: See how the sound barrier works! Models the sound waves in a jet at any speed.
Angle Caculator: A simple program that will show an angle, convert radians/degrees, and calculate slope.
Flash Cards: Make and save flash cards. Good for memorization.
Hangman: Make your own hangman game. This isn't a random generator though, so you'll need another person.