CoffeeScript on Windows?

UPDATE: See my other answer to this question, How can I compile CoffeeScript from .NET? for a far more accurate and up-to-date list of the current options.

CoffeeScript-Compiler-for-Windows works well.

Maybe it was more complicated when this question was posted. But as of 2012, CoffeeScript is as easy to use on any platform. The instructions are the same for Windows, Mac, or Linux

1. Install Nodejs from http://nodejs.org/
2. Install CoffeeScript globally with the node package manager npm install -g coffeescript or locally npm install --save-dev coffeescript
3. Write a script in your favourite text editor. Save it, say as hello.coffee
4. Run your script coffee hello.coffee or compile it coffee -c hello.coffee (to hello.js)

Node.js runs on Cygwin these days, so that's probably your best bet with getting CoffeeScript running on Windows. I'd try that first.

If you have a different preferred JavaScript runtime, you can probably use the prebuilt-compiler (extras/coffee-script.js). For example, if you include that script on a webpage, you can call

CoffeeScript.compile(code);

... to get back the compiled JavaScript string.

UPDATE 2012-04-12: Cygwin is no longer needed to run Node on Windows. Microsoft worked with Joyent through 2H 2011 to improve node's support for Windows IOCP async IO. Node 0.6 was the first release of node to natively support Windows.