X11.app
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{{Infobox Software | name = X11 | logo = Image:Apple X11.png | screenshot = Image:X11 mac gimp app.jpg | caption = X11.app running rootless on Mac OS X. The screen shows GIMP running within the X window system. | developer = Apple Computer | latest_release_version = X11 1.1 - XFree86 4.4.0 | latest_release_date = | latest_preview_version = | latest_preview_date = | operating_system = Mac OS X | genre = X11 window server/compatibility layer | license = Apple Public Source License | website = http://www.apple.com/macosx/features/x11/ }} X11.app is Apple Computer's implementation of the X Window System for Mac OS X. Apple's implementation of X11 is based on XFree86 and adds support for hardware accelerated 2D graphics, hardware OpenGL acceleration and integration with Aqua, the Mac OS X graphical user interface (GUI). X11.app was initially available as a downloadable public beta for Mac OS X v10.2 and has been included as a standard package since Mac OS X v10.3.
The source code for X11.app is available from Apple under the Apple Public Source License. [1]