Google Identity Toolkit (GITkit) helps relying party (RP) websites to support federated login easily (http://code.google.com/apis/identitytoolkit).
I've had a few issues with this one as it seems a bit overly invasive and broke some of my theme's javascript. A few modifications I made:
1. Recently added CURLOPT_REFERER => 'https://url.com', to "./git/util/gitApiClient.php" because I'm limiting the urls that my API key works for and I started getting 403 errors.
2. I also commented out the header stuff in git.js to remove the login icon all around the site. This solved my javascript breakage issues, but left wp-login.php page in tact.
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