Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Side Matter
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Bulk remove posts from category
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Timeline Module for Beaver Builder
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My auctions allegro
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Interlinks Manager – Internal Links Optimizer
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Site Chat on Telegram
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Democracy Poll
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Crypto Converter ⚡ Widget
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License Manager for WooCommerce
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Divi Advanced Custom Types
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SEO SIMPLE PACK
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Social Media Badge Widget
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Linked Variation for WooCommerce
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Age Gate
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bbPress Unread Posts v2
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Flat Preloader
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PWA for WP – Progressive Web Apps Made Simple
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iFolders – Ultimate Folder Organizer for Media Library, Pages, Posts and Users
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IP Location Block
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Page Specific Menu Items