less.js is the next evolution of LESS, eventually, it will become LESS 2.0. less.js is a complete rewrite of LESS in JavaScript, and will be able to run directly in the browser, as well as on the server, with node.js.
var less = require('less');
less.render(".class { width: 10px * 2 }", function (e, css) {
sys.puts(css); // .class { width: 20px }
});
bin/lessc style.less
<link rel="less" href="/stylesheets/main.less" type="text/css">