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!
Dropsource - Mobile development platform for building native iOS & Android apps
Appsmoment - Appsmoment is an online application builder for iPhone, iPad, Android, and Kindle devices.
GoodBarber - GoodBarber is a mobile app creation platform.