Sass.js - API for emscripted libsass to run in the browser
MIT License
Sass parser in JavaScript. Have a look at the Interactive Playground to play around with compiling SCSS to CSS in your browser.
This is a convenience API for emscripted libsass (at v3.6.2). If you're looking to run Sass in node, you're probably looking for node-sass. Sass.js and node-sass should generate the same results.
A fair warning: minified the worker weighs 4.5MB, gzipped it's still 827KB. If you're on NodeJS, please use the (considerably faster) node-sass instead.
You may also be interested in giving Dart Sass a shot.
Sass.js is used in the following tools:
Sass.js is - as libsass and emscripten are - published under the MIT License.