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HBase provides support to handle BigTable - billions of rows X millions of columns. It is a scalable, distributed, versioned, column-oriented store modeled after Google's Bigtable and runs on top of HDFS (Hadoop Distributed Filesystem). It features compression, in-memory operation per-column. Data could be replicated between the nodes. HBase is used in Facebook and Twitter.
SocialAuth.NET as a Security Token Service (STS). STS is a form of web endpoint which facilitates delegation of authentication requirements to a separate centralized setup. It currently authenticates users with Facebook, Yahoo, Google, MSN, Twitter, MySpace and LinkedIn.
Scribe is a server for aggregating log data that's streamed in real time from clients. It is designed to be scalable and reliable. It is developed and maintained by Facebook. It is designed to scale to a very large number of nodes and be robust to network and node failures. There is a scribe server running on every node in the system, configured to aggregate messages and send them to a central scribe server (or servers) in larger groups.
DotNetOpenAuth provides support for your site visitors to login with their OpenIDs by just dropping an ASP.NET control onto your page. It could be customized, how OpenID will operate on your site. It supports OpenID, OAuth and Infocards authentication. User registration and Signup of your site will be handled by this library. Users having Google, Twitter ID could login in to your site without having to create their own login.
OmniAuth is a library that standardizes multi-provider authentication for web applications. It was created to be powerful, flexible, and do as little as possible. Any developer can create strategies for OmniAuth that can authenticate users via disparate systems. OmniAuth strategies have been created for everything from Facebook to LDAP.
The Oauth Daemon is the open source version of the OAuth.io core. This is a background api server that runs on your own server that allow your clients to authenticate to any 70+ available OAuth provider.
RSS Bandit is a free application that allows you to read news feeds (both RSS and Atom feeds) and download podcasts from your desktop. It also can synchronize with your feeds in Google Reader and the Facebook news feed.