I’m slowly but surely switching everything I use to FOSS alternatives and after using Gboard for a while thanks to it’s good swipe typing, I moved to OpenBoard for the same reason. Unfortunately, the fact that I can’t auto-fill my password via 1Password is bugging me (on top of less-than-ideal autocorrect). You guys know any alternatives?
Keepass2Android provides both an autofill function and an alternative keyboard. As the name implies, it works with a Keepass file.
KeePass DX also has a virtual keyboard called "Magikeyboard" that will type entries for you. Great UI and a biometric unlock feature, too.