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DJGPP
The DJGPP suite provides 32-bit GNU tools for the MS-DOS environment. To quote the web page:
DJGPP is a complete 32-bit C/C++ development system for Intel 80386 (and higher) PCs running MS-DOS. It includes ports of many GNU development utilities. The development tools require a 80386 or newer computer to run, as do the programs they produce. In most cases, the programs it produces can be sold commercially without license or royalties.
The name comes from the initials of D.J. Delorie, who ported the GNU C++ compiler, g++ to MS-DOS, and the text initials of g++, GPP. It grew into essentially a full Unix environment on top of MS-DOS, with all the GNU tools and bash as its shell. Unlike cygwin or UWIN (see later in this Appendix), you don't need a version of Windows, just a full 32-bit processor and MS-DOS. (Although, of course, you can use DJGPP from within a Windows MS-DOS window.) The web site is http://www.delorie.com/djgpp/.