Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Gravatar Signup Encouragement
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Category Image(s)
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Author List
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FoxyShop
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Fetch JFT
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Paystack WooCommerce Payment Gateway
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AI Mojo – ChatGPT / GPT-3 Playground for WordPress
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Free Property Valuation (Lead Generator) / Kostenlose Immobilienbewertung
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System Requirements Check
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Sign Me Up
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Panda Pods Repeater Field
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PayHere Payment Gateway
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WP About Author
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WP-WebAuthn
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taf-metar-widget
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Count Characters, Words and Paragraphs while typing
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Simple Shortcode Calendar
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Fancy Comments WordPress
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Classic Menu Block
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Qikink Print On Demand and DropShipping