https://github.com/Helium314/HeliBoard
https://github.com/openboard-team/openboard
https://github.com/rkkr/simple-keyboard (guessing, since AOSP Keyboard works and this is a fork)
Not open source: https://www.microsoft.com/en-us/swiftkey
Does not have glide/swipe (reserved for symbols), but I just installed and giving it a shot: https://github.com/Julow/Unexpected-Keyboard
It does have glide typing, even.though I don't use it.
It rather uses long-tap to access multiple symbols, and can be split or pushed to a corner on devices with a big screen.
https://github.com/Helium314/HeliBoard
https://github.com/openboard-team/openboard
https://github.com/rkkr/simple-keyboard (guessing, since AOSP Keyboard works and this is a fork)
Not open source: https://www.microsoft.com/en-us/swiftkey
Does not have glide/swipe (reserved for symbols), but I just installed and giving it a shot: https://github.com/Julow/Unexpected-Keyboard