Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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WC – APG Free Shipping
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Breadcrumb NavXT
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Wholesale Market
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Simple Local Avatars
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GIF Animation Preview
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GiveWP – Donation Plugin and Fundraising Platform
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Easy Post Series
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The WP Remote WordPress Plugin
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Remove Dashboard Access
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PowerPress Podcasting plugin by Blubrry
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Customizer for WooCommerce
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FikraTicker
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WP Inventory Manager
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Inline Spoilers
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SchedulePress – Auto Post & Publish, Auto Social Share, Schedule Posts with Editorial Calendar & Missed Schedule Post Publisher
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FlatPM – Ad Manager, AdSense and Custom Code
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Automatically Hierarchic Categories in Menu
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Debug
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WP Admin Category Search
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Collapsible Widget Area