Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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WCFM – Frontend Manager for WooCommerce
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Restrict Usernames Emails Characters
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AccessibleWP – Accessibility Toolbar
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FlexMeeting – Webinar & Meeting Plugin for Jitsi Meet
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MapSVG – Vector maps, Image maps, Google Maps
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RestaurantPress
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Sprout Invoices – Client Invoicing & Estimates
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WP Upload Size
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Location Weather – WordPress Weather Forecast, AQI, Temperature and Weather Widget
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Affiliates
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WPC Frequently Bought Together for WooCommerce
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Price Calculator Block – Calculate Price Based on Quantity or Options
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WPMR Google Feed Manager for WooCommerce – Sell on Google Merchant Center & Shopping
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Conflict Finder
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Table rate shipping for WooCommerce
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GTmetrix for WordPress
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Placeholder Image for WooCommerce
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Social Media Auto Poster – Schedule & Publish to Buffer
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Content Copy Protection & Disable Right Click
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Advanced Custom Fields (ACF®)