Simple CwTrainer what can be used to learn morsecode using Koch -method.
Download CwTrainer, and run it: java -jar CwTrainer.jar
When you see main window, press practice right side of "Koch method", press play and start typing letters on the field above of "play" -button. When morsing stops, press check -button, what updates your points next to "Koch method" -text.
If your points is more than 90%, increase number next to points by one, press GENerate and press practice...