WPMU DEV - WordPress User Sync 1.1.6

Sync user accounts and transfer profiles across multiple WordPress installations.

User Synchronization links user profiles across multiple single WordPress installations.
Create and manage user accounts on one master list that can be used to connect with any subsite–without Multisite.

Smarter, Safer, User Management
Automated profile, password, user role and email address share and sync moves user management to one convenient location. Connect more people to more content by allowing users to register once on a master list and use the same login credentials across any attached site.

Protect your users with bulletproof security keys. Leave sites connected for ongoing continuity or transfer users and disconnect. Use uninstall and completely wipe your database clean from any plugin artifacts.