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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
OpenRoads Designer - A detailed design application for roadway, surveying, drainage, and subsurface utilities that supersede capabilities previously delivered by InRoads and GEOPAK
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.