The Cygwin Ports collection contains ports of many useful utilities which are not available in the standard Cygwin distribution.

MinGW is a gcc compiler configuration which does not use Cygwin. Instead, it uses the Microsoft MSVCRT as its C library. If you want a Win32 native compiler without Linux API support, this is for you.

Cygwin does not yet run natively on 64-bit Windows hosts however MinGW-w64 project provides toolchains which produce native Windows 64-bit binaries. These binaries do not, of course, use the Cygwin DLL.

If you are interested in DOS-based GNU tools, see the DJGPP Home Page. DJGPP is a somewhat similar project that concentrates solely on DOS-hosted tools.