SCARM - Simple Computer Aided Railway Modeller
WinTrack - Track planing software
RailModeller - RailModeller is a new application for creating model railroad and slot car layouts.
TrainCad - Freeware Microsoft Windows program for designing model railroad layouts using standard tracks.
TensorFlow - TensorFlow is an open-source machine learning framework designed and published by Google. It tracks data flow graphs over time. Nodes in the data flow graphs represent machine learning algorithms. Read more about TensorFlow.
AnyRail - AnyRail makes model railroad design so easy, it's fun!