Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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WP Call Button – Easy Click to Call Button for WordPress
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bbPress Unread Posts v2
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Blog Copier
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Simple Download Monitor
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Automatic Expiration for Categories
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Footnotes Made Easy
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BuddyPics
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WP Downloader
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BlackBox Debug Bar
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SOOZ – AI for SEO – Bulk Generate Focus Keyphrases, Metadata, Alt Text (SEO Autopilot)
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Random Banner
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Notification – Custom Notifications and Alerts for WordPress
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Childify Me
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Query Multiple Taxonomies
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WP Search Suggest
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Custom Sender for Email Before Download
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WP Theater
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Per User Prompt for Google Authenticator
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Simple Website Redirect
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Admin Menu Editor