Non-GNU Open Source Tools
The FSF doesn't control open source development, although it has contributed many of the most basic tools for cross-platform programming and technical computer use. In this section I highlight a couple of the more useful cross-platform non-GNU open source tools.
The XFree86 GUI Environment
XFree86 (http://www.xfree86.org) is an implementation of the X Window System (X for short) for x86 computers. X is a windowing environment that is common on UNIX systems and less common on other platforms. Nonetheless, XFree86 is available for OS/2 and BeOS, and commercial X implementations are available for Windows (see http://www.hcl.com/products/nc/exceed/index.html, http://www.starnet.com/,and http://www.microimages.com/freestuf/mix/ ...
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