ATN Site Manager is an advanced and responsive php content management system (CMS), which can be integrated to an existing website or used to create a new one. The administration panel coming with the software allows the administrator to easily add new pages to the website, edit the content of the pages with a WYSIWYG editor and also manage their settings like meta tags and others, create custom server site forms like contact or feedback forms, add additional administrator users and assign their permissions and many others. ATN Site Manager is provided with the full not encrypted source codes making possible also for other developers to make changes in them or add additional features if necessary.