Almost all open source android software you can get through Obtainium, but Obtainium is not in the play store. I think you have to use f-droid. 

 I use these but I dont see Minibits available there, only the beta it seems. They only put their app on the Play Store.  

 Minibits is still in beta, and that is what they publish to the play store. 

 Makes sense