Uruk is a wrapper for Linux ip[6]tables. A very simple shell script, but useful if you need similar (but not the same) packet filtering configurations on lots of hosts. It uses a template file, which gets sourced as a shell script, to get lists of source addresses, allowed to use specific network services. Listing these groups of allowed hosts and allowed services is all what's needed to configure your box.
Main difference with other firewall setup tools: uruk is just a very small (just 11K!) shell script, no gui, no interactive setup, no default configuration. You'll like this if you'd rather not have lots of (probably buggy) code between you and your filtering rules.