Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
-
Simple Todo List
-
Categories Images
-
Kognetiks Chatbot for WordPress
-
Ajax Filter Search
-
WPS Bookings for WooCommerce
-
DK PDF – WordPress PDF Generator
-
Ultimate Responsive Image Slider
-
NoMorePass Login
-
Accordions
-
Search and Replace Text
-
Meks Smart Author Widget
-
c3 Random Quotes
-
WP-Appbox
-
Bogo
-
Duplica – Duplicate Posts, Pages, Custom Posts or Users
-
MeasureSquare Flooring Calculator
-
WebinarIgnition – Live, Automated & Evergreen Webinar System also for WooCommerce
-
Widgets Reloaded
-
Ruven Themes: Sharing Links
-
Yandex Mail SMTP Server for WordPress