There’s also LuLu from Objective-See (https://objective-see.org/products/lulu.html https://objective-see.org/products/lulu.html), and for Linux, there’s OpenSni

There’s also LuLu from Objective-See (https://objective-see.org/products/lulu.html https://objective-see.org/products/lulu.html), and for Linux, there’s OpenSnitch (https://github.com/evilsocket/opensnitch https://github.com/evilsocket/opensnitch)