Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Retrigger Notifications Gravity Forms
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WPvivid Backup for MainWP
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Site Chat on Telegram
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Registered Users Only
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Recent Posts FlexSlider
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Automatic Featured Images from Videos
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Divi Advanced Custom Types
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Social Media Badge Widget
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Orderable – Restaurant & Food Ordering System
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Admin Management Xtended
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Child Pages Shortcode
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Depicter — Popup & Slider Builder
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XT Floating Cart for WooCommerce
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Export All URLs
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Arconix Shortcodes
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Accordions – Responsive Accordion & FAQ Plugin for WordPress
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Functionality
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bbPress Unread Posts v2
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301 Redirects & 404 Error Log
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Sport Predictions for JoomSport