I've got a couple ideas that I'm playing around with and I'm looking for a program that is comparable to Palm's "Graffiti" text program. Preferably something open source.

I'm in the beginning stages of things and trying to get my ducks in a row (data/information gathering) before I dive into this.

I did run across something called "Tapatap" by Simputer out of India, but I haven't tried it yet. If you're familiar with this program or at the very least have heard of it, and would care to shed a little light on it, that would be helpful.

Any other help, advice, or a push in "some/any" direction would be extremely appreciated as well.