RailModeller - RailModeller is a new application for creating model railroad and slot car layouts.
SketchUp - 3D for Everyone
AnyRail - AnyRail makes model railroad design so easy, it's fun!
ArchiCAD - ArchiCAD 16 enables BIM modeling with a new green approach to planning. Create anything you need with ArchiCAD's flexible new features for design.
TrainCad - Freeware Microsoft Windows program for designing model railroad layouts using standard tracks.
e-Builder - e-Builder is a construction program management solution that manages capital program cost, schedule, and documents.