http://www.macnn.com/articles/01/12/05/ipnetsharex.1.0b1/
IPNetShareX 1.0b1 offers UI for natd, ipfw
updated 08:45 am EST, Wed December 5, 2001
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The freeware IPNetShareX 1.0b1 from Sustainable Softworks offers graphical access to the OS X Network Address Translation (natd) services: "Natd is an inherent Mac OS X service which can be set up to share a single Internet connection among multiple computers without requiring a dedicated hardware router. IPNetShareX can be used as a Mac OS X alternative to the basic Internet sharing feature of IPNetRouter." However, it does not have IPNetRouter features such as filtering, DHCP server, and port mapping.
