Morpholio Trace - Morpholio Trace is widely called to be the dream software of the designers and architect.
cmftStudio - GUI counterpart of cmft - cross-platform open-source cubemap filtering tool.
DWG FastView - DWG FastView for Windows is a lightweight dwg/dxf drawing viewer and editor produced by Gstarsoft, no need of dwg format conversion, vector graph magnified without distortion and full compatible with AutoCAD DWG/DXF.
open3mod - A free, Open-Source 3D Viewer designed to make it all easier. Massive 3D Format support
Drawing Desk - Drawing Desk Draw Paint Color, Doodle and Sketch Pad created and published 4Axis Technologies for Android and iOS devices.
Online 3D Model Converter - free online 3D model converter, upload a model and export it into popular formats