Speedtest by Ookla - Measure your ISP's performance in a click
ngrok - ngrok enables secure introspectable tunnels to localhost webhook development tool and debugging tool.
TripMode - Manage your Mac's broadband usage while on a hotspot
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
Slowy app - Simulate custom Internet connection speeds for testing
TrafficMonitor - TrafficMonitor is a network monitoring suspension window software in Windows.