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FreeCAD 1.0 finally dropped!
(www.freecad.org)
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Yeah, there's a 3rd-party driver called Spacenav that works pretty well. I haven't gotten the two side buttons on my mini wireless one though.
(I wouldn't bother with the driver from 3DConnexion as it hasn't been touched in 10 years old)
ETA: The settings for it in FreeCAD is at Tools>Customize>Spaceball Motion/Buttons
Oh, cool! Excellent.