amphetype - Advanced typing practice program
TypingMaster - Learn touch-typing technique, and improve/increase typing accuracy and speed.
Tach Typing Tutor - Tach Typing Tutor is an open-source advanced typing tutor for Windows that you can use to improve your typing speed, accuracy, and skills.
Type Fu - Type Fu is an app that will teach you how to type fast. The right way. On Mac, Windows and Chrome OS.
TypeLit.io - Improve your typing by practicing on classic books such as Alice in Wonderland, Frankenstein, and The Art of War -- or get a monthly subscription and import your own EPUB, PDF, and TXT files.
Tux Typing - Tux Typing is a free and open source typing tutor created especially for children.