This plugin allows your users to sign in with any OAuth provider. There are many pre-configured sites such as Facebook, Google and Microsoft.
Please note: earliest version tested is 3.7. It will probably work with earlier versions but this has not been tested.
The OAuth plugin for WordPress allows you to provide authentication against any OAuth provider. This plugin is uses the OAuth library by Manuel Lemos. The plugin allows the admin to select any from the services supported out-of-the-box by the said library. Additionally it is possible to configure a service manually, which means almost any site supporting the OAuth protocol can be used.