Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Photo Gallery by 10Web – Mobile-Friendly Image Gallery
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Public Post Preview
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Retro Game Emulator
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Rel Nofollow Checkbox
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Compress PNG for WP
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Categories Images
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Bulk Edit Categories and Tags – Create Thousands Quickly on the Editor
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Linguator AI – Auto Translate & Create Multilingual Sites
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Open External Links In New Windows
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WP Attachments
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Jovvie Point of Sale POS for WooCommerce
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WP About Author
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Markup by Attribute for WooCommerce
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Post Navigator
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Count Characters, Words and Paragraphs while typing
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Category Editor
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Captcha Spam Blocker
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WPshop 2 – E-Commerce
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WC Shop Sync – Square Payment Gateway and Product Synchronization for WooCommerce
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Clearblue® Ovulation Calculator