Check out the assistant toolset for generating, controlling, managing, and configuring X11 in your system. Create a customizable environment with options to modify source code, selected windows, interleave the X11 elements with Aqua components, implement scripts, etc.
OroborOSX is an X11 environment designed for use in rootless mode with XDarwin on Mac OS X. The source code is also available.
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A free program for Mac, by Pocket Bits LLC.
