[lcnmrn]

Simple Keyboard is both on F-Droid and Play Store. https://github.com/rkkr/simple-keyboard

[betamike]

Just a note for anyone checking it out, Simple Keyboard doesn't support spellcheck (which is why I use OpenBoard instead).

[fogihujy]

I'll add a vote for Simple Keyboard. It's lightweight, fast, and does exactly what it says on the package.