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+---
+title: Overview
+order: 1
+layout: page
+---
+
+[[addons.overview]]
+= Overview
+
+In addition to the components, layouts, themes, and data sources built in into
+the core Vaadin library, many others are available as add-ons.
+link:http://vaadin.com/directory/[Vaadin Directory] provides a rich collection
+of add-ons for Vaadin, and you may find others from independent sources. Add-ons
+are also one way to share your own components between projects.
+
+Installation of add-ons from Vaadin Directory is simple, just adding an Ivy or
+Maven dependency, or downloading the JAR package and and dropping it in the web
+library folder of the project. Most add-ons include a widget set, which you need
+to compile, but it's usually just a click of a button or a single command.
+
+After trying out an add-on, you can give some feedback to the author of the
+add-on by rating the add-on with one to five stars and optionally leaving a
+comment. Most add-ons also have a discussion forum thread for user feedback and
+questions.
+
+Add-ons available from Vaadin Directory are distributed under different
+licenses, of which some are commercial. While the add-ons can be downloaded
+directly, you should note their license and other terms and conditions. Many are
+offered under a dual licensing agreement so that they can be used in open source
+projects for free, and many have a trial period for closed-source development.
+Commercial Vaadin add-ons distributed under the CVAL license require installing
+a license key as instructed in
+<<dummy/../../../framework/addons/addons-cval#addons.cval,"Installing Commercial
+Vaadin Add-on Licence">>.
+
+
+