WebC makes it easy to compile your jade/coffee-script/less files and test them locally in the browser. It can watch the files for changes and even serve them through a static web server locally for testing.
via npm:
$ npm install webc
$ webc --help
$ webc compile
Compiles your files to _output. Use --out to specify diferent output directory.
$ webc watch
Same as compile, but compiles if changes happen.
$ webc serve
Same as watch but as well serves the files through http://localhost:3000. Use --port to change the port.