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Re:LeoCAD – A CAD program for creating virtual Lego models by tgb on Wednesday July 19, 2017 @11:31AM (#14804996)
Oh yeah gearing. I guess this really does deserve the title of CAD software at that point.
Re:LeoCAD – A CAD program for creating virtual Lego models by bonzini on Wednesday July 19, 2017 @11:37AM (#14805042)
Even without gearing, and staying within the studs-based construction system, the possibilities are really endless. Search YouTube for "creator expert" Lego timelapse videos ("speed build").

Even kids-oriented sets sometimes enjoy using advanced build techniques. You can start with "Lego 31036 speed build" as the search query to enter the rabbit hole from.