[p932]

Datahand are also an alternative to traditional keyboards: http://octopup.org/computer/datahand

[extra88]

You can't buy one new anymore, you might be able to find one on eBay or something.

[muaddirac]

I'm a little late to jump in but I've been watching this project with interest over the past couple of years:

https://geekhack.org/index.php?topic=41422.25

It's not complete yet, but most of the pieces are there.