MailServe is a graphical application that helps you set up the built-in Postfix mail server on Mac OS X. It sets up SMTP, UW/IMAP, POP3 and Fetchmail services, including support for SSL and SMTP authentication.
By using MailServe in conjunction with its Fetchmail capability, you can funnel all of your email from remote mail servers to your own local server, and check email using POP or IMAP from that server instead.
Version 3.0.4 - the latest version for Mac OS X 10.5 - adds the following:
Version 4.1.4 - the latest version for Mac OS X 10.6 - adds 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!