SolidCAD, a division of Solid Caddgroup Inc.

Formit

Intuitive 3D sketching app with native Revit interoperability.
 
Formit
FormIt supports iteration with Revit® to connect your design concepts to BIM without remodeling. Also available in a Pro version with more capabilities and features.
 
Features
Capture your design when inspiration strikes with familiar, easy-to-use sketching tools.
Connect conceptual designs to BIM workflows with native Revit integration.
Sketch on the go with apps for iOS and web. (Windows app with FormIt Pro).
Create your design presentation by using flexible visualization options and animated scenes.