All Trumba spud (widget) code is JavaScript, so unfortunately there is no way to embed Trumba spuds without using JavaScript. However you could fake the embed by instead embedding the Trumba Hosted version of any published calendar. For example, you could embed this using an IFRAME or a FRAMESET. Here's an IFRAME that does just that:
<html>
<body>
<iframe src="[url="https://www.trumba.com/calendars/webname"]https://www.trumba.com/calendars/webname" frameborder="0" width="100%" height="100%"></iframe>
</body>
</html>
When using the Trumba Hosted view, you are limited by the layout, the limited spuds and Trumba branding. To get a lesser set of Spuds you'd have to use JavaScript. We also offer CSV, ICS, XML, RSS and JSON feeds for every published calendar that you can pull and possibly parse to embed and render a calendar on your site.
CUSTOMIZE CALENDAR FEEDS: https://www.trumba.com/help/api/customfeeds.aspx