Bootsmart is the best front and back end multi vendor marketplace on Codeigniter Platform. Multivendor Ecommerce Script is developed in Code Igniter PHP framework with MYSQL Database.
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CodeCanyon - Scripts and Snippets From $1 for PHP, JavaScript, ASP.NET, CSS, Plugins, HTML5, Mobile and more
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Sell My App - Sellmyapp is a top quality mobile source codes marketplace with strong community elements
Theme Forest - The #1 marketplace for premium website templates, including themes for WordPress, Magento, Drupal, Joomla, and more. Create a website, fast.