Using wp single login you can easily add the functionality to allow only single login per user.
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Disable WP Registration Page Spam
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Automatic Expiration for Categories
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Duplicate Widgets
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Void Elementor Post Grid Addon for Elementor Page builder
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jQuery Pin It Button for Images
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Front Page Scheduler
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Preload Images
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jQuery Post Splitter
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AR for WordPress
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Decent Comments
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Dokan Kits
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WPC Composite Products for WooCommerce
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Radius Portfolio – Filterable Grid, Gallery & Slider Portfolio
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Spam Destroyer
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Sublanguage
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Responsive Videos by Angie Makes
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Move Comments
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Sliced Invoices – WordPress Invoice Plugin
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Random Banner
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Bulk Page Generator and Mass Page Builder – Page Generator