Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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WPBruiser {no- Captcha anti-Spam}
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Responsive Slider Gallery – Responsive Image Photo Slider
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Ultimate Maps by Supsystic
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Comment Approved
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Responsive Full Width Background Slider
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SAR Friendly SMTP
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Super RSS Reader – Add attractive RSS Feed Widget
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Fluid Player
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Migrate to WordPress.com
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Smart Image Resize – Make WooCommerce Images the Same Size
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MC4WP: Mailchimp Top Bar – Email Subscribe Notification Bar
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RevivePress – Keep your Old Content Evergreen
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Elemailer Lite – Elementor email template & campaign builder
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WP-KaTeX
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Pretty Google Calendar
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hCaptcha for WP
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Stock Dependencies for WooCommerce
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Filter Everything — WordPress & WooCommerce Filters
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Voice Comments & Reviews – Heyoya
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Better Find and Replace – AI-Powered Suggestions