This is the most approaching clone of Google Reader I've seen so far.
It has one big problem, however:
A feed can have only one tag (or, if you see a tag as a folder, a feed can be only in one folder).
This is a big problem because Google Reader's UI encouraged to add multiple tags on a feed (you didn't moved a feed from one folder to an other : you selected a list of tags the feed appear in). And the OPML format allows this too.
So, if you import an OPML export, half your feeds may appear to be missing.
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An other great Google Reader alternative is http://yoleoreader.com/ . Apart from its UI sometimes freezing for a second (maybe due to synchronous I/O or too long script execution), it's an other great Google-Reader-like RSS reader.
I've been enjoying https://digg.com/reader as a "close-enough to Google Reader" substitute, as well. They launched a mobile-browser-friendly update a few days ago, and the Android app is supposedly "very soon" to release.
Granted, it's a one man shop, but he's charging $9-$29/year, so hopefully enough to keep it running.
It's written in Haskell and Ur/Web, is quite fast, took my Google Reader takeout with no issues (400 feeds scattered across 35 folders)
Allows login via Twitter, Facebook, Google or OpenID.
It has one big problem, however:
A feed can have only one tag (or, if you see a tag as a folder, a feed can be only in one folder).
This is a big problem because Google Reader's UI encouraged to add multiple tags on a feed (you didn't moved a feed from one folder to an other : you selected a list of tags the feed appear in). And the OPML format allows this too.
So, if you import an OPML export, half your feeds may appear to be missing.
---
An other great Google Reader alternative is http://yoleoreader.com/ . Apart from its UI sometimes freezing for a second (maybe due to synchronous I/O or too long script execution), it's an other great Google-Reader-like RSS reader.