MKS Toolkit

Perhaps the most established Unix environment for the PC world is the MKS Toolkit from Mortice Kern Systems:

MKS Canada - Corporate Headquarters
410 Albert Street
Waterloo, ON  N2L 3V3
Canada
+1 519 884-2251
+1 519 884-8861 (fax)
+1 800 265-2797 (sales)
http://www.mks.com

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The MKS Toolkit comes in various versions depending upon the development environment and the number of developers who will be using it. It includes a shell that is POSIX-compliant, along with just about all the features of the 1988 Korn shell, as well as over 300 utilities, such as awk, perl, vi, make, etc. Their library supports over 1,500 Unix APIs, making it extremely complete and easy to port to the Windows environment. More information is available at http://www.mkssoftware.com/products/tk/ds_tkdev.asp.