Just Color Picker - Free portable colour picker and colour editor for web designers, photographers, graphic designers and digital artists. Supports Windows and macOS.
Synthesia - A fun way to learn how to play the piano.
Instant Eyedropper - Identifying the color code of an object on the screen is usually an involved, multistep process:...
Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.
gcolor2 - GTK+2 Color Selector
Playground Sessions - Online piano learning game.