Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Sticky Floating Forms Lite
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ELEX WooCommerce Product Price Custom Text (Before & After Text) and Discount
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Extra Product Sorting Options for WooCommerce
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Simple Link List Widget
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Move Comments
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Timeline Block For Gutenberg
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Gravity Forms Duplicate Prevention
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Payment Gateway for MTN MoMo on WooCommerce
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PayPal Digital Downloads
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Variation Swatches for WooCommerce – Color, Image & Size Swatches
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Booktics – Booking Calendar for Appointments and Service Businesses
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Media Cleaner: Clean your WordPress!
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Cyr to Lat Enhanced
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Carts Guru
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Image Title Remove
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RSS Aggregator by Feedzy – Feed to Post, Autoblogging, News & YouTube Video Feeds Aggregator
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CBX Bookmark & Favorite
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Gutena Forms – Contact Form, Survey Form, Feedback Form, Booking Form, and Custom Form Builder
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Flexible Subscriptions
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Interact: Embed A Quiz On Your Site