X11 for Mac OS X - from Apple itself - offers a complete X Window System implementation for running X11-based applications on Mac OS X 10.3 Panther (users of prior versions of Mac OS X should use XFree86, and Tiger users have the latest version on their installer DVDs). Based on the de facto-standard for X11, the open source XFree86 project, X11 for Mac OS X is compatible, fast and fully integrated with Mac OS X. It includes the full X11R6.6 technology, including a window server, libraries and basic utilities such as xterm.
X11 for Mac OS X takes advantage of the Mac OS X Quartz graphics system to deliver hardware-accelerated 2D and 3D graphics. Quartz provides snappy scrolling speeds for text, live drag and resize of windows, as well as 3D animation through OpenGL Direct Rendering. X11 for Mac OS X combines the display and client libraries into a single download and install, so getting X11 running on Mac OS X is easy. The installer sets up your environment with your path and DISPLAY. It also makes it simple to start xterm sessions and other popular X11 utilities. Additionally, you can use any three-button USB mouse with X11 for Mac OS X.
Version 1.0 - the latest version for Mac OS X 10.3 - adds/changes the following:
Version 1.1.3 - the latest version for Mac OS X 10.4 - adds/changes the following:
Version 2.1.6 - the latest version for Mac OS X 10.5, and available only as part of the Mac OS X 10.5.7 update (and which reports itself as version 2.0 in the Finder) - makes unspecified changes.
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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!