Use APKPure App
Get Race Selection for SmashUp old version APK for Android
Randomize vos factions Smashup
One more app to randomize your factions in SmashUp.
Select expansions that you have and get the list of random factions for each player and corresponding bases.
App is fully free. No ads.
You can find the source code at https://github.com/yvvan/SmashUpRaceSelection