Seven Languages in Seven Weeks from pragprog Ruby http://ruby-lang.org/ http://en.wikibooks.org/wiki/Ruby_Programming http://en.wikipedia.org/wiki/Ruby_(programming_language) Io http://www.iolanguage.com/ http://en.wikibooks.org/wiki/Io_Programming http://en.wikipedia.org/wiki/Io_(programming_language) https://github.com/stevedekorte/io Prolog http://www.gprolog.org/ http://www.swi-prolog.org/ http://en.wikibooks.org/wiki/Prolog http://en.wikipedia.org/wiki/Prolog http://slackbuilds.org/repository/13.1/development/gprolog/ Scala http://www.scala-lang.org/ http://en.wikipedia.org/wiki/Scala_(programming_language) http://slackbuilds.org/repository/13.1/development/scala/ http://www.scala-lang.org/node/1305#Resources http://programming-scala.labs.oreilly.com/ Erlang http://www.erlang.org/ http://en.wikibooks.org/wiki/Erlang_Programming http://en.wikipedia.org/wiki/Erlang_(programming_language) http://slackbuilds.org/repository/13.1/development/erlang-otp/ Clojure http://clojure.org/ http://en.wikibooks.org/wiki/Clojure_Programming http://en.wikipedia.org/wiki/Clojure Haskell http://haskell.org/ http://en.wikibooks.org/wiki/Haskell http://en.wikipedia.org/wiki/Haskell_(programming_language) http://slackbuilds.org/result/?search=haskell&sv=13.1