jCore is a Multi Site web Content Management System build especially for webmasters (using the well known LAMP environment) who have to maintain multiple websites for their clients and they would like to keep the source codes up to date and easily fix bugs for all clients at once. Because jCore use a Dynamic Web 2.0 layout, the designer's job is totally separated from the developer as the designer can create new Blocks (divs) from the admin area and define any style (CSS) / script (jQuery) for them and even limit these blocks to be shown only to defined menu items or registered/guest users and even include contents in blocks without having the need for developer to do so.