keybr

I like this a lot, except for the way punctuation and capitalization are handled: they are just tick boxes in the settings menu. So you practice touch typing, the algorithm adds new letters one-by-one as you get faster, and all is well until you have a decent result using all the letter keys. Then you tick the setting to add punctuation and it dumps ten new keys on you at once, including some that need shift.

Ideally punctuation should be handled the same way as letters, added one-by-one as the algorithm detects that your speed is improving.

The way keybr works is better explained here: How does Keybr.com work?

Klavaro is a good option (lots of keyboard layouts, other languages), but it comes second to the method keybr uses.