Is an open source, responsive content management system that you can use to build responsive sites. Respond features a REST API, a lightning-fast Angular-powered UI, Bootstrap 3.0, Polymer-based plugins, multilingual support, and an enhanced data layer using PDO.
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https://github.com/madoublet/respond
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similar - http://www.queness.com/post/14579/6-lightweight-flexible-php-cms
origin - http://www.pipiscrew.com/?p=3557 cms-respond-cms