Arachne is a newcomer web framework.
Quoting the site's description:
Arachne is a full, highly modular web development framework for
Clojure. It emphasizes ease, simplicity, and a solid, scalable
design.
It has a
kickstarter campaign
claiming to offer a "getting started" experience similar to Rails. It is
developed by a Cognitect.
Here is
a good discussion about it with the author of Luminus (yogthos).
