Mayo

Open-source 3D CAD viewer and file converter supporting STEP, IGES, STL, glTF, and more.

Desktopfree

Mayo is a free, open-source 3D CAD viewer and file converter built with Qt and OpenCascade. It reads and writes formats including STEP, IGES, STL, glTF, and OBJ, offers clip planes, assembly exploding, and measurement tools for reviewing models, and includes a command-line interface for batch conversion. It's aimed at engineers who need to inspect or convert CAD files across formats without opening full CAD software.

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Problem & pain-point mapping
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What it's a strong alternative to
Trust & credibility signals

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