Mobidonia - Native mobile app builder for iOS, Android & Apple Watch
Fuse - Fuse is a UX tool suite for mobile app designers and developers.
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!
AppSheet - AppSheet enables users to create mobile apps instantly for both OS and Android.
GoodBarber - GoodBarber is a mobile app creation platform.
Appzio - Appzio platform allows full stack developers to create native apps for iOS and Android just from the backend.