PW32 the POSIX-over-Win32 layer - Implementation and subset of POSIX/Unix API for Win32 systems. Focus: efficiency, full platform coverage, with good support for low-end Win9x systems. Based on DJGPP runtime library by DJ Delorie. [Open Source, LGPL]
DJGPP - DOS port of the GNU C/C++ compiler and tools; 32 bit, highly optimizing, up-to-date, and free (GPLed).
Porting Unix to Windows NT - By David G. Korn;, 1997, USENIX paper (abstract, full text requires membership) describes AT&T UWIN project.
Hamilton C Shell - Recreates original Unix C shell and utilities fully from scratch, adds many enhancements, for Windows 95/98/Me/NT/2000/XP, OS/2.
MKS Unix-Windows Co-Existence Products - Toolkit suite of Unix and NT utilities for Windows, X Windows display environment, NutCracker development, interoperability, runtime environment.
Windows NT Services for Unix - Microsoft product suite; has list of features, system requirements, evaluation tools, common questions, support, related books/products, pricing.
Interix - Provides cross-platform interoperability applications, development kits, solutions and tools.
Cygwin - Linux-like environment for Windows making it possible to port software running on POSIX systems (such as Linux, BSD, and Unix systems) to Windows. News, documentation and software downloads.
UnxUtils - Native Win32 ports of some GNU utilities. Does not include compilers.
GnuWin32 - The project provides Win32-versions, native ports, of GNU tools or tools with a similar open source licence. Does not include compilers. Docs, downloads and links to related sites.
MinGW: Minimalist GNU for Windows - Compiler system uses GCC to produce Windows programs. Win32 ports of GCC, GDB, binutils to build native Win32 programs that rely on no 3rd party DLLs. Website also contains MSYS, a Minimal SYStem, a shell, with which a configure script could be executed.
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