Maxum Development produces the Rumpus FTP server, featuring:
Version 6.2.10 - the latest version for Mac OS X - adds/changes the following:
Rumpus comes in two editions: standard and professional. The standard version supports up to 32 simultaneous users and 32 user accounts defined in Rumpus' built-in security. For larger sites and ISPs, Rumpus Pro supports up to 256 simultaneous connections, and user accounts defined in built-in security are limited only by RAM. Besides these differences, the Standard and Pro versions are identical. Pricing for Rumpus standard ranges from $249 (1 server) to $1,494 (10 servers); pricing for Rumpus professional ranges from $395 (1 server) to $2,370 (10 servers). The Rumpus ordering page has 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!