What are some alternatives?
Fuse - Fuse is a UX tool suite for mobile app designers and developers.
OpenXava - OpenXava is a Web Java Framework for Rapid Development of Enterprise Applications.
Dropsource - Mobile development platform for building native iOS & Android apps
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!
Open As App - Automatically create a business app from a spreadsheet, no coding.