Web Service for Remote Portlets (WSRP) is a standard for aggregating content within a host system, allowing the content to come from an external system, yet styling to be provided by the host.
SharePoint has 'support' for WSRP since SharePoint 2007, via the WSRP Viewer web part (Enterprise), however while it may technically meet the standard it is all but useless for anything except the most basic of requirements (as at the current version, SharePoint 2013).
Continue reading WSRP ‘support’ in SharePoint 2013(4 min read)