UnexpectedKeyboard is amazing. Changed to it after BlackBerry keyboard.

tho there's absolutely zero dictionary and prediction, the fact it has proper modifier keys like ctrl, alt, function keys alone takes the cake, but you can literally map any character to anywhere, and access even more by swiping on the keys.

I don't know how's the developnent, haven't checked for updates for a while, because I modified it a bit for my taste.

It's kinda on my list to fork it and add autocorrect, dictionary and prediction to it, unfortunately I don't have much time :/