Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Cron Jobs
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Smart App Banner
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Campi Moduli Italiani
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Event Tickets Manager for WooCommerce
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Contact Form Clean and Simple
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Text Scroll Widget
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Slate Admin Theme
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iubenda | All-in-one Compliance for GDPR / CCPA Cookie Consent + more
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BuddyPress Featured Members
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Skill Bars
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Optimize Database after Deleting Revisions
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SearchWP Live Ajax Search
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Contact Form & SMTP Plugin for WordPress by PirateForms
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AJAX Login and Registration modal popup + inline form
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ilGhera Danea Exporter for WooCommerce
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Blog Designer Pack – Blog, Post Grid, Post Slider, Post Carousel, Category Post, News
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Featured Galleries
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NS Smooth scroll back to top
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WP w3all phpBB
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Sticky CTA – Sticky Floating Notification bar, Buttons, Call To Action A/B Testing