Re:4Clojure hits 100K solved problems.
by jvc26 on Tuesday January 03, 2012 @04:56PM
(#3421496)
Whilst it doesn't tell you about the stack it's running on, the site code is open source: https://github.com/4clojure/4clojure
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Looks like mongodb + compojure + some other interesting libraries (clojail for protected eval, for example), running on a Linode.