STEP format is probably the most used accurate 3D geometry exchange format.
(It can contain a lot more than just geometry!)
STL files (most often used in 3D printers) are based on triangles, which are
basically only an approximation of the real geometry.
A lot of available
STEP-file viewer are windows-only.
I’ve been looking for a simple
STEP-file viewer for UNIX-like operating
systems, so that I can see the parts that I’m making using cadquery
(see also: cadquery documentation).
I’m not a fan of IDE’s like cq-editor or IDE’s in general. In particular, cq-editor pulls in the whole of spyder (a Python IDE) just to get syntax highlighting in its built-in editor.