XBMC Media Center is currently available for Ubuntu Linux, Mac OS X (Intel-based Leopard, Tiger, and Apple TV), Microsoft Windows, and the original (first-generation) Xbox. The current stable release is 8.10, codenamed Atlantis. Below you can download ready to install packages of XBMC for your platform. (Note: XBMC requires OpenGL support.*)
XBMC for Mac

Mac OS 10.4 and 10.5 are supported for Intel Macs.

XBMC for Linux

Instructions

Binaries for Ubuntu are available as Ubuntu PPA (Personal Package Archives).

XBMC for Windows

Windows XP and Windows Vista are supported.

XBMC for ATV

Instructions

Instructions for easy installation of XBMC for Mac onto Apple TV via ATV USB Creator.

XBMC Live

ISO image for creating a bootable CD to try XBMC. Also installable to a USB flash drive.

XBMC for Xbox

For legal reasons we cannot host or distribute binary builds of XBMC. Try google to find third-party binary builds.

Source Code and Development Version

The latest development version of XBMC, (often referred to as “SVN”), is updated as soon as developers commit any changes, and is hosted in Subversion kindly provided to us by by SourceForge. Development version of XBMC  is recommended only for developers, experienced testers, or those otherwise interested in compiling from XBMC from source code. XBMC can be checked out using a Subversion client:

Linux, Mac OS X / Apple TV, and Windows branch of XBMC
# svn co http://xbmc.svn.sourceforge.net/svnroot/xbmc/branches/linuxport/

Xbox branch of XBMC
# svn co http://xbmc.svn.sourceforge.net/svnroot/xbmc/trunk/

*OpenGL

XBMC requires OpenGL 1.4 hardware support, at a minimum, to function. We do however recommend a ATI/AMD, Intel, or NVIDIA graphic controller that support OpenGL 2.0 or better to fully experience XBMC at its best. Check your graphics device drivers to see what version of OpenGL your GPU (graphics processing unit) harware supports. If your platform of choice is Mac OS X and your system has an Intel chipset (Mac Mini, MacBook or a MacBook Air), then even though the drivers only support OpenGL 1.2, XBMC will run smoothly since most of the required functionality in the drivers is implemented through OpenGL extensions which are still support in those drivers on Mac OS X.

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