Florisboard. It has glide-typing, and I found it to be better than AnySoftKeyboard. Main downside is it doesn't have next-word suggestions yet, but that's planned for the next major release.
Don't get me wrong, the fact that this is a brand new keyboard app and not a fork of the AOSP one with no significant changes (hi OpenBoard) does throw quite a large wrench into the works, but development is going so slowly even on a de-Google'd ROM I had to resort to switching back to Gboard with internet access cut off to have anything I write have any sort of resemblance to understandable language.
In settings there's a 'Gestures & Glide typing' option. It does say that it currently only supports US English, so if you have another language set that could be the issue?
That's also meant to be changing with the next major release though.