Web Crossing, Inc. produces Web Crossing, a high-end, high performance news/chat/discussion server system that runs on many platforms, including Mac OS and Mac OS X. Web Crossing may be extended via a host of plugins that provide a great variety of additional functionality, from blogs to wikis, and beyond. Features include:
Web Crossing also produces bundled solution suites (groups of plugins forming a complete, integrated package) that provide the Web Crossing product in special configurations for three select environments:
Pricing depends upon the combination of users, page views, and features that you choose. See the official pricing page for more information.
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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!