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CraftBook is an heavily customizable plugin that adds interactive mechanisms, and redstone features, and minecart enhancements to multiplayer. It was created in October 2010 by sk89q and requires Bukkit. Downloads, instructions, and more information can be found on its CraftBook wiki page.
For an up-to-date list of features, see: http://wiki.sk89q.com/wiki/CraftBook/Usage