I wish handlebars had this. I have to usually resort to having a property tell me if it's the last item in the collection =/

Regardless, I wouldn't even consider Walrus until there was server-side support.

Walrus has no dependencies, not even on the DOM. While it was built for client-side use specifically, there should be no reason it couldn't work in a server-side environment. I'd be glad to whip up a sample node app if people needed some proof-of-concept.