There are many alternatives to IceFloor for Mac and since it's discontinued a lot of people are looking for a replacement. The best Mac alternative is Little Snitch. It's not free, so if you're looking for a free alternative, you could try Murus Firewall or Stronghold. If that doesn't suit you, our users have ranked five alternatives to IceFloor and four of them are available for Mac so hopefully you can find a suitable replacement.
Firewall application for monitoring and controlling outbound network connections, notifying users of attempted access, supporting rule-based blocking, real-time alerts on suspicious activity, and preventing unauthorized data transmission on macOS systems.
Radio Silence lets you block individual apps from accessing the internet. It never throws pop-ups on the screen, and is completely invisible.
Murus is a frontend for the OS X PF network firewall. From basic filtering to advanced proactive options, Murus allows to easily configure a complex network setup dragging and dropping icons and moving sliders and selecting checkboxes.
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