!!! https://github.com/Prismatic/plumbing

http://blog.clojurewerkz.org/blog/2013/02/11/introducing-titanium/
http://titanium.clojurewerkz.org/
https://github.com/clojurewerkz/titanium
http://thinkaurelius.github.com/titan/

Lists:
http://adambard.com/blog/clojure-batteries-included/

Zippers:
http://www.exampler.com/blog/2010/09/01/editing-trees-in-clojure-with-clojurezip/

Validation/Coercion
https://github.com/prismatic/schema