drydenmaker

Places user information in the global session for use in other applications on the same domain. Currently used by a Crossley Framework (http://bit.ly/18hJsP) Auth module. When used, a unauthenticated user can request an application page outside WP that requires authentication. The module then forwards teh person to the WP Login page, which once authentication is finished, forwards the user back to the initial requested page. Then the application can peer into who the user is as far as WP is concerned and decide what to do from there.

WP Passport

Places user information in the global session for use in other applications on the same domain.  Currently used by a Crossley Framework (http://bit.

atdev

The phpMyDirectory WordPress plugin allows wordpress users to log into phpMyDirectory. The plugin is configured in the WordPress admin area.
Users only need to log in once and they will be automatically logged into phpMyDirectory. This allows phpMyDirectory to be used alongside WordPress and for a directory to be easily created for WordPress.

phpMyDirectory

Allows wordpress users to automatically log into phpMyDirectory.  The sessions are shared and accounts are created automatically if they do not exist.

WP Passport vs phpMyDirectory