I’ve used #VailCW rather a lot while learning CW and recently dug up two older projects that seemed worth putting back in the light. It is a small attempt to give something back to a system I found genuinely excellent. And broadly, my tiny contribution to FOSS.

One is a CW adapter that speaks Vail over MIDI on a $2 Digispark, with USB and a local sidetone buzzer. It's faster than a keyboard with no audio delay.
https://github.com/yo3gnd/cw-digispark-vail-midi