From The NATural home page: "The NATural is a GUI tool to manage the NAT settings of Mac OS X Server. The NATural allows you to configure many of the settings that Server Admin will pass to natd. Apple's Server Admin software provides only a limited interface to control NAT routing functions. The underlying process, natd, can accept many more arguments. Although Server Admin does not provide an interface to these functions, it does respect all settings that natd supports." The NATural allows you to easily configure the following settings (and many others):
Version 1.0b2 adds/changes the following:
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Can't find what you're looking for? Try a search:
Also, if you have an older Mac, be sure to check out the "Classic" applications page for more options.
Finally, take a look at ALEMIA if you think you know that name of an application, but aren't quite sure.
Mac OS X has a huge amount of TCP/IP-based server software built into it that I don't specifically cover here. Your "Sharing" Preference Pane allows you to enable and disable these services with a click of the mouse. The software running behind the scenes to provide many of these services is generally of the open source variety. The standard release of Mac OS X includes, among many others:
Of course, Mac OS X Server includes many more, in addition to offering more recent versions of many of the above servers.
Graham Orndorff has written a superb collection of articles on setting up email servers and secure email clients on Mac OS X.
These are applications that are newer and of potential interest, but which I haven't yet selected for permanent inclusion. Have a look, and let me know if you think they deserve to be part of the permanent collection!