GoodBarber - GoodBarber is a mobile app creation platform.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Fuse - Fuse is a UX tool suite for mobile app designers and developers.
Xamarin.Android - Integrated environment for building not only native Android but iOS and Windows apps too.
Dropsource - Mobile development platform for building native iOS & Android apps
Kodular - Much more than a modern app creator without coding