Homebrew/homebrew — pull request #28255 by jzelinskie (2014-04-08 18:29:00+00:00)
Title: DuckDNS 1.0 (new formula)

DuckDNS is a free replacement for DynDNS dynamic DNS.

Currently, they're telling users to setup a cronjob (cron has been disabled since OSX 10.8).
This script updates your IP, provides a convenient dotfile for configuration, and supports launchd.