Unity - The multiplatform game creation tools for everyone.
AppyPie AppMakr - AppMakr is a browser-based platform designed to make creating your own iPhone app quick and easy.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Bizness Apps - Create your own app or become a reseller and build apps for others
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.