Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Cart All In One For WooCommerce
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TinyPNG – JPEG, PNG & WebP image compression
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Checkout Field Manager (Checkout Manager) for WooCommerce
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WP Custom Login
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Batcache
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Popular Widget
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Jquery news ticker
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WPFront User Role Editor
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xBooster Social Icons with Counter
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UltraAddons for Elementor
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MaxiCharts Query Builder Add-on
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Price Calculator Block – Calculate Price Based on Quantity or Options
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Less PHP Compiler
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Knowledge Base CPT
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Animate In View
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Search Console
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Support Hours
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PageSpeed Module
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Issues and Series for Newspapers, Magazines, Publishers, Writers
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Simple Link Library