Simple Number Typing Tutor helps you to learn typing numbers on a keyboard. Most typing tutors help you only to learn how to write words. I needed something to learn typing numbers correctly. There is probably nothing more simple out there. The tutor simply generates a random sequences of numbers you need to type in.
Python support is needed.
Simply run
$> ./sntt
Or make a link ...
$> cd ~/bin
$> ln -s link/to/sntt.git/sntt
... and then run
$> sntt
GPLv3, see COPYING file