Looking for basic CAD/Modeling programs to build a model with? We recommend Tinkercad as an entry level CAD program and Blender as a entry level modeling program. For model repair, we recommend Netfabb and Autodesk Meshmixer.

HELPFUL PROGRAMS & PAGES

List of free & commercial CAD Software and free STL viewers (via 3ders.org)
Autodesk Meshmixer, free STL modification/editing software (also useful for STL repair)
Download for classic Makerware software (highly preferred over Makerbot Print)

FILE REPAIR

Mesh Repair in Rhino (via SAIC)
Mesh Repair in Rhino (via UPenn)
Repairing STLs in Meshlab & Netfabb (Shapeways)
Tips to Resolve 3D Model Issues in Netfabb (Shapeways)

VIDEO TUTORIALS

Rhino Video Tutorials (via Kyle Houchens)
Rhino Tutorials (via Lynda)
AutoCAD Tutorials (via Lynda)
SolidWorks Tutorials (via Lynda)

Using the Sense Handheld 3D Scanner
Object 3D Scanning with itSeez3D & the Structure Sensor
Face 3D Scanning with itSeez3D & the Structure Sensor
Full Body 3D Scanning with itSeez3D a& the Structure Sensor