Edit: I’m reading in the comments that FUTO is non-commercial, therefore it does not meet the OSI definition of open source (even though it does seem to provide code and allow for modification and redistribution). So keep that in mind while reading.

I’ve been using FUTO Keyboard and like it. It has swipe, voice annotation, undo/redo, clipboard manager, and it’s fairly customizable.

It has some AI functions but I turn them off, aside from voice input, because typing becomes a bit laggy (on my old phone at least). You can import different language models for the AI and voice stuff. The voice input is pretty impressive. The swipe is okay, I think it will get better over time. They use their own non-Google dataset/library for swipe (which you can contribute to by swiping on their website keyboard).

It’s still in alpha. I think it was started or funded by Louis Rossman as something to attempt a private, and offline equivalent of the Google Android keyboard.

It’s impressive for being relatively new. I hope they continue to get funded and work on it.

Earth is like a giant nut.

A lot of web software does this (Github and Gmail for example). I like it but always thought it could be abused.

Stealth is another really nice Android client that is account-free for those who don’t want an account or to login but still want to subscribe and save posts locally.