Prepros

Prepros can compile almost all preprocessing languages, like Sass, Less, Stylus, Cssnext, Jade/Pug, Markdown, Slim, and Coffeescript.

It lets you code in a simple editor window, with syntax highlighting. You can also view the result instantly in your connected web browser; Prepros reloads your browser automatically every time you save a file in code editor.

This IDE lets you minify and optimize CSS, javascript, and images with a single click.