HSTS is HTTP Strict Transport Security, a means to enforce using SSL even if the user accesses the site through HTTP and not HTTPS.
More Plugins
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Sitekit
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WP Caregiver
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IE6 Upgrade Option
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Archive Control
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WP Nasa/ADS Query Importer
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Snapchat Snapcode Widget
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Extended Coupon Features for WooCommerce FREE
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ChannelSale: WooCommerce Plugin to Sync Multi-Marketplace Product Listings
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Categories For Gravity Forms
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Sell License Key Codes with WordPress PHP-KeyCodes
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qTranslate-X & Yoast SEO
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Scale It UP!
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Quick Checkout, Direct Checkout Button, Quick View for WooCommerce
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GP Additional Links
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BMI Calculator by Calculator.iO
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ALMEFY: Two-Factor Authentication in one step. Without password
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Options View
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Generic Stats
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Ultimate Searchable Accordion Lite – WPBakery Page Builder Addon
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WP-Socialight