Plugin allow to use Google Apps Accounts as Crowd custom directory. Since now you can manage user accounts in one place in Google Apps an use it in your whole organisation infrastructure.
Keep in mind it is not an SSO. With Google Apps Directory for Crowd you can login to any of your apps with username and password given in Google Apps - like in LDAP approach.
Install and Upgrade link to instruction and upd...
Administrator's Guide Google Apps For Crowd link to user guide
Buy Licenselink to licensing