I'm looking for a feed reader that has both: web-interface and a standalone client for the dektop. Like that, I could read my feeds from every omputer with an internet connection and from my PC even if I'm currently offline. Both interfaces should sync.

I'm know there are Google Reader clients (at least one) but I don't want to rely on a company to host the common database and the web-interface. I'd like the server part to be open-source, too.

Is there something like this out there?