LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Civil 3D - Civil 3D supports BIM for civil engineering design and documentation for rail, roads, land development, airports, water and wastewater, and civil structures.
FreeCAD - An open-source parametric 3D modeler
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…
gCAD3D - 3D - CADCAM - Software for MS-Windows and Linux. Freeware
Site3D - Site3D is a fully featured software product for the engineering design of road systems, roundabouts, residential developments and earthworks.