You will find in this page pointers to several sites that provide binaries and/or sources for tools and IDEs (Integrated Development Environments) for Windows platforms.
Mingw32 tools (official site). It is recommended to install MSYS which provides make, sh and other utilities needed to build GEL.
Embedded GNU IDE (Eric Engler). Supports gcc and GEL.
Syn Text Editor.
Mingw32 tools, that is Mumit Khan's GNU tools. You will find here many Unix tools that have been ported for Windows NT: make, shell, gcc, ...

If you want to use make, be sure to get a shell (like zsh or any other).
Here are some ports of common GNU utilities to native Win32. In this context, native means the executables do only depend on the Microsoft C-runtime (msvcrt.dll) and not an emulation layer like that provided by Cygwin tools.
IDE for Windows and Linux platforms. Supports Gcc.
The famous Emacs editor/IDE. Syntax coloring, automatic indentation, multi language (C, C++, Java, Ada, Python, Perl, Lisp, HTML, asm, ...), incremental search, tag search, many modes (compile, gdb, mail, news, browser, shell, ...), and more and more and more.

You can get the binaries for Windows at: