Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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PAYMILL for WordPress
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Rel Nofollow Checkbox
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Search and Replace Text
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Categories Images
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c3 Random Quotes
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WPS Bookings for WooCommerce
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DK PDF – WordPress PDF Generator
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Urvanov richtext addfmt
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Ultimate Responsive Image Slider
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Infinite Scroll and Load More Ajax Pagination
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Accordions
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Scrolling Text Module for Beaver Builder
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Widgets Reloaded
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Meks Smart Author Widget
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WP-Appbox
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My Youtube Playlist
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Bogo
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Duplica – Duplicate Posts, Pages, Custom Posts or Users
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Hide Broken Shortcodes
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Simple Indeed Jobroll Widget