Autodesk Tinkercad - Tinkercad is a super easy-to-use, browser based 3D design tool.
HeeksCAD - HeeksCAD is a free, open source, CAD application - Imports solid models from STEP and IGES files.
ArchiCAD - ArchiCAD 16 enables BIM modeling with a new green approach to planning. Create anything you need with ArchiCAD's flexible new features for design.
FreeCAD - An open-source parametric 3D modeler
SketchUp - 3D for Everyone
JS.Sketcher - Parametric 2D and 3D CAD modeler written in pure javascript