Simply prevent duplicate submissions by blocking the submit button while submitting
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Ultimate WP Mail
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Post Navigator
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Cyrlitera – Transliteration of Links and File Names
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Shopping Cart & eCommerce Store
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Count Characters, Words and Paragraphs while typing
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Comment Email Reply
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Relative URL ShortCode
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Slider Factory
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Advanced Sidebar Menu
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In Depth Articles Generator
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FA Sport Odds
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Affiliates
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WPC Frequently Bought Together for WooCommerce
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Price Calculator Block – Calculate Price Based on Quantity or Options
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WPMR Google Feed Manager for WooCommerce – Sell on Google Merchant Center & Shopping
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Extended Post Status
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Disable Updates – Updates Manager, Disable Automatic Updates, Disable All Updates
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PageSpeed Module
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Frontend Post Submission Manager Lite – Frontend Posting WordPress Plugin
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Kraken.io Image Optimizer