Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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WP Bulk Delete
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WP QuickLaTeX
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WP Notes Widget
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FluentSnippets – The High-Performance file based Custom Code Snippets Plugin
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Gravity Booster – Styles & Layouts for Gravity Forms
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Events Made Easy
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Photo Gallery – Responsive Image Galleries by Supsystic
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Sidebar Menu Widget
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Product Editor Pro – WooCommerce Bulk Edit: Prices, Stock, Images, Titles, CSV Import & More
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Agy verification
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Fake Pay For WooCommerce
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Title to Terms Ultimate
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WP Responsive Video
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Login for Google Apps
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PanoPress
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PDF for WPForms + Drag and Drop Template Builder
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Leaflet Maps Marker (Google Maps, OpenStreetMap, Bing Maps)
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GedShow
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ACF OpenStreetMap Field
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Profile Extra Fields by BestWebSoft