GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
SCARM - Simple Computer Aided Railway Modeller
TinyWall - Lightweight and non-intrusive firewall
RailModeller - RailModeller is a new application for creating model railroad and slot car layouts.
Little Snitch - Little Snitch is a firewall application that monitors and controls outbound internet traffic.
AnyRail - AnyRail makes model railroad design so easy, it's fun!