Simply prevent duplicate submissions by blocking the submit button while submitting
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Newsletter – Send awesome emails from WordPress
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Advanced IP Blocker
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TableOn – WordPress Posts Table Filterable
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Tag, Category, and Taxonomy Manager – Autotagger Automatically Add Terms
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Post Affiliate Pro
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JSM Non-Breaking Space (nbsp) for French Content
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Gutena Forms – Contact Form, Survey Form, Feedback Form, Booking Form, and Custom Form Builder
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Interact: Embed A Quiz On Your Site
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Flexible Subscriptions
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wp-Typography
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Related Posts for WordPress
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PDF Thumbnails
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Tooltipy (tooltips for WP)
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Virtual Classroom – Video Conferencing & Online Meeting with BigBlueButton
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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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Replace Image
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Widgets for Reviews & Recommendations
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WP Mailto Links – Protect Email Addresses