Bizness Apps - Create your own app or become a reseller and build apps for others
FreeCAD - An open-source parametric 3D modeler
GoodBarber - GoodBarber is a mobile app creation platform.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.
SketchUp - 3D for Everyone