Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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WPMR Google Feed Manager for WooCommerce – Sell on Google Merchant Center & Shopping
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Disable Updates – Updates Manager, Disable Automatic Updates, Disable All Updates
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Frontend Post Submission Manager Lite – Frontend Posting WordPress Plugin
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Kraken.io Image Optimizer
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Animator – Scroll Triggered Animations
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Easy Digital Downloads – Additional Shortcodes
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FA Sport Odds
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Unify
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CM E-Mail Blacklist – Simple email filtering for safer registration
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HivePress Geolocation
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GTM4WP – A Google Tag Manager (GTM) plugin for WordPress
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Home Categories
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MaxiCharts Query Builder Add-on
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Support Hours
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Mention comment's Authors by Wabeo
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Auto Featured Image from Title
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Automatic Responsive Tables
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Photo Contest | Competition | Video Contest
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RUA Blog Subscriber Lite
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Payment On Delivery for WooCommerce