Mayo is a 3D CAD viewer and converter based on Qt and OpenCascade.
Mayo can read/write 3D files from/to STEP, IGES, STL and many other CAD formats. Mayo 3D viewer supports clip planes, exploding of assemblies, measurement of shapes, and show/hide parts.
This is free and open source software.
Key Features
- 3D clip planes with configurable capping.
- 3D exploding of the model tree allowing better exploration of complex designs.
- 3D measure tools for circles, angles, lengths, areas, bounding box, …
- 3D view cube providing intuitive camera manipulation.
- Quick access to CAD files recently open thanks to thumbnails in the Home page.
- Toggle item visibility within the Model tree(use checkbox).
- Customizable mesh precision for BREP shapes, affecting visualization quality and conversion into mesh formats.
- Convert files to multiple CAD formats from command-line interface.
- Formats supported:
- Import: STEP, IGES, BREP, DXF, OBJ, gITF, VRML, STL, AMF, PLY, OFF, 3MF, 3DS, FBX, Collada, X2D, and X(DirectX).
- Export: STEP, IGES, BREP, OBJ, gITF, VRML, STL, AMF, PLY, OFF and image files (including PNG and JPEG).
- Cross-platform support – runs under Linux, macOS, and Windows.
Website: github.com/fougue/mayo
Support:
Developer: Fougue Ltd
License: BSD 2-Clause “Simplified” License

Mayo is written in C++. Learn C++ with our recommended free books and free tutorials.
Related Software
| 3D Model Viewers | |
|---|---|
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| Mayo | 3D CAD viewer and converter |
| fstl | Viewer for .stl files. It uses Qt |
| Castle Model Viewer | Supports 3D and 2D model formats |
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| Exhibit | 3D model viewer for the GNOME desktop |
| Tatlin | 3D STL and Gcode viewer |
| voxcii | Terminal-based ASCII 3D model viewer |
| dcat | Terminal-based 3D model viewer |
| term3d | Terminal-based 3D model viewer |
Read our verdict in the software roundup.
Explore our comprehensive directory of recommended free and open source software. Our carefully curated collection spans every major software category.This directory is part of our ongoing series of informative articles for Linux enthusiasts. It features hundreds of detailed reviews, along with open source alternatives to proprietary solutions from major corporations such as Google, Microsoft, Apple, Adobe, IBM, Cisco, Oracle, and Autodesk. You’ll also find interesting projects to try, hardware coverage, free programming books and tutorials, and much more. Discovered a useful open source Linux program that we haven’t covered yet? Let us know by completing this form. |

