I was going to note that 8pen[1] was left out of the Android list, but it doesn't appear to be on the Play Store right now. According to their website they are working on a new version.

[1] http://www.8pen.com/

Most of the iOS ones have been on Android for a long time. Obviously, it's easy to get yourself up to speed on the new platform when you've already done all the R&D and just need to do a port.

Because the guy who wrote this website is an iOS junkie?

You want your keyboard to be fun and quirky?