I spent time to test a lot of joomla extensions in order to setup the right "pakcage" to deal with on customers projects. Fabrik is one of the incredible ones. It allows to build a real complex application with no, or few, coding and great looking. It allows access to remote db, make joins, dynamic pull-down menus, graphic integration, joomla content integration (and reverse)... I'm still figuring out all the possibilities.