Liferea supports Tiny Tiny RSS sync, so that could be it. You can host http://tt-rss.org/ and use Liferea as desktop app (and may be the web interface for mobile).
In fact that's the only part that I really liked of Google Reader: it was the perfect backend (I got used to the web interface, but the real experience was with the native apps).
It would be nice to have a "standard" API for RSS sync that could be implemented by servers and clients. In that way we could host our own RSS backend in the same way we run a SMTP and IMAP servers to have our own independent email infrastructure.
Tiny Tiny RSS API could be a good start, or we can agree on a Google Reader compatible API.
I've used liferea with google reader for some time to keep things synced between computers and devices. I really hope some of those projects to keep that API alive bear fruit just for that. Though I have seen liferea become non-responsive when having 1000-2000 feeds to check (like other places, i just add stuff and never delete, because there's too many to sort through...)
In fact that's the only part that I really liked of Google Reader: it was the perfect backend (I got used to the web interface, but the real experience was with the native apps).
It would be nice to have a "standard" API for RSS sync that could be implemented by servers and clients. In that way we could host our own RSS backend in the same way we run a SMTP and IMAP servers to have our own independent email infrastructure.
Tiny Tiny RSS API could be a good start, or we can agree on a Google Reader compatible API.