A web framework for building web platforms instead of websites/apps, where a web platform is specifically intended to integrate untrusted 3rd party apps/plugins

A web framework for building web platforms instead of websites/apps, where a web platform is specifically intended to integrate untrusted 3rd party apps/plugins/etc - eg Facebook, Twitter, etc. See GitStar (http://gitstar.com/ http://gitstar.com/) for a simple implementation - a code repository like GitHub except where all functionality is implemented by untrusted 3rd party plugins.