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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.
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
Fing Desktop - Device discovery and network monitoring
SafeBase - SafeBase is the interactive security portal to share your security posture, automate access to sensitive compliance information, and subscribe to vendor security program updates.
Vanta - Automate compliance, simplify security.
Netdata - Monitor your servers, containers, and applications, in high-resolution and in real-time.