Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Draft List
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Autocomplete WooCommerce Orders
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Change WordPress Login Logo
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Simple Location
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Sitewide Notice WP
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bbPress – Do Short Codes
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Conditional Payments for WooCommerce
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WP Event Aggregator: Import Eventbrite events, Meetup events, social events and any iCal Events into Event Calendar
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Announcement & Notification Banner – Bulletin
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Bulk Edit Easy Digital Downloads – Fast Bulk Creator
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TotalSurvey for Survey, Quiz and Form
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Quick Download Button
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Innovs WPBakery Visual Composer WHMCS Elements
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Estatik Mortgage Calculator
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Admin and Customer Messages After Order for WooCommerce: OrderConvo
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Custom Fields Permalink 2
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WP Login Form
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States, Cities, and Places for WooCommerce
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Related Products Manager for WooCommerce
