Simply prevent duplicate submissions by blocking the submit button while submitting
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Photo Gallery – Responsive Image Galleries by Supsystic
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Estatik Mortgage Calculator
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Custom Fields Permalink 2
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Related Products Manager for WooCommerce
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Radio Station by netmix® – Manage and play your Show Schedule in WordPress!
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Login for Google Apps
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PanoPress
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WP Responsive Video
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Tabs popular posts and latest posts
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Autonomos
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Leaflet Maps Marker (Google Maps, OpenStreetMap, Bing Maps)
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ACF OpenStreetMap Field
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Profile Extra Fields by BestWebSoft
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OTP Login & Register Woocommerce
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Votely by WPGens
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Quick 301 Redirects
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Duplicate Menu
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WP-Members Membership Plugin
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Simple Download Monitor
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Disable WP Registration Page Spam