Softorino YouTube Converter - Download YouTube video & audio. Watch and listen offline
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
Yout - YouTube to Mp3 Converter
Fing Desktop - Device discovery and network monitoring
You-Get - Command-line utility to download media contents from the web
Radio Silence - Radio Silence is a network monitor and firewall for the macOS. The software stops apps from making network connections. The firewall runs in the background and does not require an open window.