I purchased a USB adapter to connect my CW paddles (1/8-inch audio plug) to the computer. I can now use Vband on-line chat to practice keying CW with other people.
The adapter simulates Left and Right Ctrl keys with the morse key, and the website interprets that as dits and dahs. It works really well.
I also found Morse Invaders, which is a typing tutor that uses CW: key the word before it hits your city.
Minor Linux Note:
I use keyd to remap
some keys on my laptop,
so be aware how it may
mess with the Ctrl Keys.