
Mac OS X v10.5 Leopard and The UNIX® You Know, The Mac You Love
The most widely-sold UNIX operating system, Mac OS X version 10.5
Leopard combines a fully-conformant UNIX foundation with the richness
and usability of the Macintosh interface, bringing multi-core technology
and 64-bit power to the mass market. In Leopard, the new tabbed
Terminal, Ruby on Rails web application stack, and powerful scripting
bridges make UNIX users more productive than ever.
Even better, all the UNIX technology in Mac OS X (aka "Darwin") is
Open Source so you can download it for free, examine it, and modify it
directly. If you are interested in learning more about the UNIX
underpinnings of Mac OS X, as a developer or administator, please visit
the Open Source topic page.
For existing UNIX developers, the X11 windowing system is built-in to
Mac OS X (as an optional installation). This windowing system is used by
many existing UNIX applications to draw windows, controls, and other
elements of a graphical user interface. The Mac OS X implementation of
X11 is integrated with the Quartz drawing environment to give
applications a native Mac OS X feel. This integration also makes it
possible to display X11 windows alongside windows from native
applications written in Carbon and Cocoa.
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