fph FUTO Keyboard is source available, not open source, by the traditional definition of open source. It's worth noting that the license is stricter than a typical non-commercial usage license because it disallows removing monetization they add to the app. Typically, a non-commercial usage license would allow someone to non-commercially redistribute a modified version without monetization features included. They could not take payments for it, monetize it, etc. and whether or not they could take donations is debatable but probably allowed as long as absolutely nothing was provided in return for them.