WebConcess is a solution designed to create special web sites for automobile activities. For years, it was used by the eBay company as the exchange platform for dozens of thousands of advertising. We used to have overnight up to 40.000 ads in process.
The site did work for more than 4.000 families in France, Canada, Belgium and Switzerland during about 10 years. It is now disabled for new registration but is still active. However, I found it still unmatched on its human-machine interface, very handy and intuitive. Visit the site as it still exist today : http://www.myfamilink.com