Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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iPanorama 360 – Advanced Virtual Tour Builder
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Posts and Users Stats
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Announcements
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MotoPress Appointment Booking
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Gone Response
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Primary Categories
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WPJM Extra Fields
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Featured Image Zoom
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Smart Popup by Supsystic
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Image Hotspot Block
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SendPress Newsletters
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Photoswipe for NextGEN Gallery
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MMWW
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BSK PDF Manager
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Social Media Auto Poster – Schedule & Publish to Social Post Flow
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WP Night Mode
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End Page Slide Box
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System Requirements Check
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AMP WP – Google AMP For WordPress
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WP Modal Popup with Cookie Integration