FUTO Keyboard is a modern, privacy-focused keyboard that runs fully offline. Enjoy swipe typing, autocorrect, predictive text, and more—no internet connection required.
This is a very solid alternative to Google’s keyboard, the only issue is that it’s not European.
EDIT: one possible issue with HeliBoard is that swype input relies on an external closed-source library that needs to be downloaded and installed manually.
A truly open alternative would be Heliboard:
https://github.com/Helium314/HeliBoard
EDIT: one possible issue with HeliBoard is that swype input relies on an external closed-source library that needs to be downloaded and installed manually.