Using wp single login you can easily add the functionality to allow only single login per user.
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International Telephone Input for Contact Form 7
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Login IP & Country Restriction
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Maintenance Mode
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Disable WYSIWYG
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Draft List
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Image Rotation Repair
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Custom Datepicker NMR
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WP Inline Edit
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Easy Google Fonts
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Embed Plus for YouTube Gallery, Livestream and Lazy Loading with Facades
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Product Import Export for WooCommerce – Import Export Product CSV Suite
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Taxonomy Metadata
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Autoship Cloud for WooCommerce Subscription Products
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MultiParcels Shipping For WooCommerce
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Seraphinite Post .DOCX Source
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Simple Universal Google Analytics
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User Profile Picture
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Website LLMs.txt
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Clean Image Filenames
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BuddyPress Edit Activity