Using wp single login you can easily add the functionality to allow only single login per user.
More Plugins
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All In One Favicon
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Answering Contact Form
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Androapp – Native Android mobile app for wordpress site
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Frontend Dashboard Pages
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Table of content
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Disable auto-update Email Notifications
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Preview Link Generator
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File Sharing & Download Manager – User Private Files
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Better My Sites Menu
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Correos de Costa Rica Shipping Plugin
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Flexible Product Fields (WooCommerce Product Addons) – WooCommerce Product Page Editor
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Saint du Jour Widget
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Yotpo: Product & Photo Reviews for WooCommerce
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Estatik Real Estate Plugin
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Hide Comments Feature
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Buddypress xProfile Rich Text Field
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Unconfirmed
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Popup Maker – Responsive popup, Exit Intent Pop up, Email Optins, Autoresponder & More
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Piano Block
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WP Categories Widget