IceFloor is described as 'The first OS X free graphic frontend for PF. Configure the PF firewall in a few clicks using a very simple interface and a step by step in-app configuration guide (Quick Start)' and is a Firewall in the security & privacy category. There are five alternatives to IceFloor for Mac and Linux. The best IceFloor alternative is Little Snitch. It's not free, so if you're looking for a free alternative, you could try netfilter or Murus Firewall. Other great apps like IceFloor are Radio Silence and Stronghold.
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.
Netfilter software comprises iptables, ipset, conntrack-tools, libnetfilter and more. It is the core of Linux firewalls and NAT. It consists of a set of hooks inside the Linux kernel and a number of utilities to manage callback functions.
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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