List of Free code Spring
oauth provider sample
A Spring Security OAuth provider, developed in my monograph about SSO and OAuth.
spring security oauth
Support for adding OAuth1(a) and OAuth2 features (consumer and provider) for Spring web applications.
spring security scribe
Spring Security Implementation for "Login with <insert social network name here>" with the scribe OAuth library.
spring social gmail
Spring social connector for gmail service (IMAP and SMTP) using OAuth.