OpenSCAD - OpenSCAD is a software for creating solid 3D CAD objects.
Civil 3D - Civil 3D supports BIM for civil engineering design and documentation for rail, roads, land development, airports, water and wastewater, and civil structures.
OpenJSCAD.org - OpenSCAD + JavaScript = OpenJSCAD, edit locally or remote online, preview in browser direct via...
SketchUp - 3D for Everyone
ImplicitCAD - ImplicitCAD is a programmatic CAD program, implemented in Haskell.
AutoTURN - AutoTURN is used to confidently analyze road and site design projects including intersections, roundabouts, bus terminals, loading bays, parking lots or any on/off-street assignments involving vehicle access checks, clearances, and swept path maneuv…