OAuth Libraries / Servers

There seems to be many library implementations of OAuth libraries out there but not much in terms of provider servers that can be used as-is. If you wish to setup an OAuth provider server, you may have to build one (though with some of the libraries, it may not be too difficult).

References:

• http://www.quora.com/What-are-some-scalable-OAuth-and-OpenID-server-implementations
• http://code.google.com/p/openid4java/
• http://code.google.com/p/idp4java/
• http://oauth.net/code/