Apple's X11 for Mac OS X
Along with Apple's many announcements, they also quietly released X11 Public Beta for Mac OS X:
- X11 for Mac OS X offers a complete X Window System implementation for running X11-based applications on Mac OS X. 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.
Apple's implementation takes advantage of Quartz to deliver hardware-accelerated graphics, and provides an easy installer.