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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Simple Tracking
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Smartcat Translator for WPML
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ARCW Popover Addon
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Webhook for Discord
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FG OpenCart to WooCommerce
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BibleGateway Links Shortcode
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Daily Bible Readings
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WP Dash Message
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Codepress Menu
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Screen Sharing System
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View Transitions
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Wava Payment Plugin
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WP Gravity Forms Zoho CRM and Bigin
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Bitcoin News
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URL ShortCodes
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Add Clone Sites for WPMU (batch)
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Polylang – Country Detection
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Lockr
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Dashboard Social Stats
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Post UI Tabs