GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
Prohunter - an android client for Product Hunt
TinyWall - Lightweight and non-intrusive firewall
SCARM - Simple Computer Aided Railway Modeller
Little Snitch - Little Snitch is a firewall application that monitors and controls outbound internet traffic.
TRAX - Trax is a free web-based tool for planning your model railroad