Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Bizness Apps - Create your own app or become a reseller and build apps for others
Xamarin.Android - Integrated environment for building not only native Android but iOS and Windows apps too.
Fuse - Fuse is a UX tool suite for mobile app designers and developers.
Kodular - Much more than a modern app creator without coding
Siberian CMS - Siberian is an Open-Source and Free App Maker. Unlimited Push Notifications. Unlimited features. Fully Customizable. Download it and build your own app now!