Mayo is a basic 3D viewer inspired by FreeCad.
Its primary goal is to visualize CAD files imported/exported with the gmio library.

Current features are :

• Multi-documents support, user can open many parts in the session
• Support of IGES/STEP/BRep formats for import/export operations
• Support of STL format with either gmio or OpenCascade(see the speed performance of gmio!)
• Save image(snapshot) of the current 3D view
• Editable 3D properties of the imported items, eg. material, color, display mode, ...

Mayo requires Qt5 and OpenCascade-7.0.0.
Although only tested with VC++/Windows it should build fine on Linux and MacOS.
cd .../mayo
qmake "GMIO_ROOT=path_to_gmio" "CASCADE_ROOT=path_to_opencascade"
(n)make