Reddit-gae is a project mainly written in Clojure, it's free.
Reddit Clojure clone on Google App Engine
An in-fieri Reddit clone written in Clojure that runs on Google AppEngine
To run reddit-gae in GAE dev server you need to: $ lein deps && lein compile $ dev_appserver.sh war/
Assuming you already have appengine in your path.
If you want a really nice interactive development you will need: $ lein swank M-x slime-connect C-c C-k in redditongae.core in slime repl: (require 'local-dev) (local-dev/init-app-engine) (local-dev/start-server (var example))
FIXME: write
Copyright (C) 2010 FIXME
Distributed under the Eclipse Public License, the same as Clojure.