Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Advanced Classifieds & Directory Pro
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Smart Attachment Page Remove
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NS Cloner – Site Copier
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Shortcode Table of Contents
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Page Speed Optimizer: HTTP/2 Push, Async JavaScript, and Defer CSS
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Beaver Builder Page Builder – Drag and Drop Website Builder
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Calculator Builder – Create an Online Calculator
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Fast Page & Post Duplicator
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WP Club Manager – WordPress Sports Club Plugin
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Give – Paystack Gateway
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WP Revisions Control
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JSM Non-Breaking Space (nbsp) for French Content
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Gutena Forms – Contact Form, Survey Form, Feedback Form, Booking Form, and Custom Form Builder
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Flexible Subscriptions
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Interact: Embed A Quiz On Your Site
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Custom Add to Cart Button Label and Link for WooCommerce
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Ultimate Post List
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LiveChat – Live Chat Plugin for WP Websites
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Minimum Order Amount for Woocommerce
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Insticator Turn Engagement into Revenue