This is hlfl.

hlfl stands for "High Level Firewall Language". It permits writing
firewalling rules using a high level language, and transforms them into
rules for real softwares, like ipfilter, ipchains or cisco rules.

You could make contact with the developers by subscribing to
<hlfl@hlfl.org>. There is also an announce ML at <hlfl-announce@hlfl.org>.
These lists are managed by majordomo (write to <majordomo@hlfl.org> with
"help" in the body of your mail).