Digital Fabrication

CREATING MODELS  (CAD)
Tinkercad – https://tinkercad.com/
Onshape – ​http://www.onshape.com
Blender – http://www.blender.org/

CREATING MODELS (VECTOR)
Sketchpad 4.1 (online)  sketch.io/
Boxy SVG (Chromebook) https://boxy-svg.com/main.html
Inkscape (Download) https://inkscape.org/en/

PLACES TO GET OBJECTS TO EDIT
Thingiverse – http://www.thingiverse.com/
My Mini Factory – http://www.myminifactory.com/
Instructables – http://www.instructables.com/howto/3d+print/
Pinshape – https://pinshape.com/