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SCARM - Simple Computer Aided Railway Modeller
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
RailModeller - RailModeller is a new application for creating model railroad and slot car layouts.
FreeCAD - An open-source parametric 3D modeler
TrainCad - Freeware Microsoft Windows program for designing model railroad layouts using standard tracks.
SketchUp - 3D for Everyone