[losingom]

FlorisBoard is open source and has an implementation for this (en-us only for now): https://github.com/florisboard/florisboard

It's okay, but definitely worse than proprietary alternatives right now. But at least it's under active development.

[driminicus]

Anysoftkeyboard (https://anysoftkeyboard.github.io/) has swype as, though in beta. I currently switch back and forth between ASK and florisboard.