keyboardlayouteditor - Powerful, visual designer for designing and editing keyboard layouts.
amphetype - Advanced typing practice program
Typewise - The next generation keyboard
TypingMaster - Learn touch-typing technique, and improve/increase typing accuracy and speed.
Typing Speed Test - A simple typing test to see how fast you can type
Type Fu - Type Fu is an app that will teach you how to type fast. The right way. On Mac, Windows and Chrome OS.