Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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Database Backup for WordPress
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Advanced Shipment Tracking for WooCommerce
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Quotes and Tips by BestWebSoft
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Simple customize
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Easy PayPal Custom Fields
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Post Type Converter
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Custom Login Widget With Cube Points Integration
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Smart Grid-Layout Design for Contact Form 7
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Starbox – the Author Box for Humans
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Accordion Toggle
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Easy Heads Up Bar
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Simple Posts Ticker – Easy, Lightweight & Flexible
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In Depth Articles Generator
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Hyper Cache
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Analytics Germanized for Google Analytics (GDPR / DSGVO)
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Simple Indeed Jobroll Widget
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Go Fetch Jobs (for WP Job Manager)
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Custom Cursor For WP
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WEN Skill Charts
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Admin Taxonomy Filter