Autoreload is a project mainly written in JavaScript, it's free.
JavaScript utility
<html>
<head>
<title>autoreload</title>
<script type="text/javascript" src="autoreload.js"></script>
<script>
observe("style.css", 3);
observe("index.html", 1);
</script>
</head>
<body>
<h1>autoreload</h1>
</body>
</html>