Using wp single login you can easily add the functionality to allow only single login per user.
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Simple XML Sitemap Generator
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WP-Paginate
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User Switcher
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WP Keap/Infusionsoft WooCommerce Plugin
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CoSchedule
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WC Duplicate Order
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Product Options and Price Calculation Formulas for WooCommerce – Uni CPO
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wp-Typography
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Widgets for Social Photo Feed
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Loading Page with Loading Screen
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APCu Manager
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Affiliate Power – Sales Tracking for Affiliate Marketers
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Replace Image
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Widgets for Reviews & Recommendations
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WP Mailto Links – Protect Email Addresses
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Social Viral Downloader
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NS WooCommerce Catalog
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WP-SynHighlight
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Order Weight for WooCommerce