• General
• Can I Use OmniAuth Instead of [Devise, AuthLogic, Clearance, etc.]?
• Can I Use OmniAuth With [Devise, AuthLogic, Clearance, etc.]?
• Does OmniAuth Have a Strategy for [insert provider here]?
• Does OmniAuth Allow for Username/Password Login?
• Troubleshooting
• My Rails session has been wiped out in my authentication callback! What do I do?  
• I'm getting an OpenSSL::SSL::SSLError when I try to authenticate. What do I do?
• How to fix OAuth::Unauthorized error for Twitter provider?
• Rails session is clobbered after callback on OpenID providers
• Problems with CA certificates during OpenID request (google, yahoo)