LuLu - macOS firewall

LuLu is the free open-source macOS firewall that aims to block unauthorized (outgoing) network traffic, unless explicitly approved by the user:

Full details and usage instructions can be found here.

To Build
LuLu should build cleanly in Xcode (though you will have to remove code signing constraints, or replace with your own Apple developer/kernel code signing certificate).

To Install
For now, LuLu must be installed via the command-line. Build LuLu or download the pre-built binaries/components from the Releases page, then execute the configuration script (configure.sh) with the -install flag, as root:

//install
$ sudo configure.sh -install

Github Project