AutoCAD MEP - AutoCAD MEP software helps you draft, design, and document building systems.
SCARM - Simple Computer Aided Railway Modeller
AutoCAD Arch - Design and document more efficiently with the AutoCAD Architecture toolset, created specifically for architects.
TrainCad - Freeware Microsoft Windows program for designing model railroad layouts using standard tracks.
DataCAD - DataCAD is a computer-aided design and drafting software for 2D and 3D architectural design and drafting
AnyRail - AnyRail makes model railroad design so easy, it's fun!