On Mac OS versions 9 and earlier, once could write applications that ran as "ACGI programs" in AppleScript or other languages that could handle Apple Events. Under OS X, Apache doesn't know how to send Apple Events, so you're out of luck. Apple includes an "ACGI Enabler" program with OS X Server, but chose not to include that with the standard edition. ACGI Dispatcher allows you to use traditional AppleScripts - or other programs that ran as ACGI programs under OS 9 - on OS X with Apache.
Version 3.0 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!