Wt

The current Wt::Auth framework is limiting, as in that it forces a user to have a username/password combination as the basis for authentication.
Nor does it allow for easily adding other types of authentication. OAuth is configurable, but no real "custom" methods are easily supported out-of-the-box.

The reworked Auth2 framework ought to resolve this. It will create an interface for authentication methods, and their related widget(s).