MooTools More plugins can be found on the official MooTools website. To see the available plugins, go to the More Builder section of the site, located at the following web address: http://mootools.net/more
The More Builder is a web tool for downloading a customized library containing your plugins of interest. You can select the plugins you'd like to acquire, and the More Builder will automatically include any other plugins and JavaScript libraries that are required (dependencies) in order for the selected plugins to work.