From blurrghost :
And the trend certainly seems to be in that direction.
Medeli ( OEM )
Fatar ( OEM )
Arturia ( proprietary )
Expressive E ( proprietary, OEM ?? )
Sequential ( proprietary, available to Novation )
Azoteq ( OEM )
TINRS ( OEM )
Behringer ( proprietary, quite likely OEM )
Have i missed any ?
( I have not included several flat non moving p-at keybeds. )
Add to this any being quietly developed.
Note too, many of the above come in various sizes and types ( synth, piano, maybe soon organ ? )
It’s for both digital and analog synths.
This sort of competition means improved quality and features, and dropping price. There may come a cross over point when except for the cheapest, the poly-aftertouch will eclipse channel aftertouch keybeds.
Even mono-synths can use p-at keybeds, like with aftertouch control on arpeggiators ( a feature pioneered on the Korg Keystage ), or on a MIDI chaining feature.
They may be funny in an annoying way, ( Robin Vincent made a humorous video about the Sequential Fourm ( post ) ), but it’s hard to miss the incoming surge.