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There are many more modules available on the PrestaShop Addons website (http://addons.prestashop.com/), PrestaShop's official marketplace Some are free, others are for-pay, and you are sure to find something that suits your needs! Once you are a seasoned module developer/theme designer, you can even submit your own creations, and sell them on Addons!
The "Modules Catalog" page gives you a quick and easy access to the online Addons database of modules and themes. Its interface is pretty straightforward:
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