FlorisBoard for several months now. It has no text prediction
The good news is that feature is currently in development. There's a beta build on GitHub that has it sort of implemented. There's some details on the FlorisBoard matrix channel on getting it.
M.A.L.P., for when Iโm playing music on the house system
Do you mind explaining your setup a bit more? I've currently got a few Sonos speakers but I don't like being locked into their system and have always been interested in a more open setup.
I've seen Snapchat and I know of MPD (but don't fully understand it, to be honest) but it seems there isn't much information about these types of setups.