For example books and dvds, a place to sleep, computers with the possibility of printing, sitting the babies, a car. And more.
These resources are shared in resourcepools. There's private and public pools, consisting of friends, neighbors or people that share interests. Some of the possibilities are distributed libraries, neighborhood pools or even production communities(filmmakers, ...).
As far as I can discern, anyone in the world can use the facility, but - as of yet - it seems to be mainly German-based.