Plone 3 Products Development Cookbook : 70 simple but incredibly effective recipes for creating your own feature rich, modern Plone add-on products by diving into its development framework
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The Plone Content Management System is one of the best open source CMS, because by using Plone's development framework you can extend its functionality according to the specific requirements of your website. The Plone framework has lots of components that can be used to create add-ons or extensions
