This Add-one is useful for spam prevention, you can set a limit to the Gravity Forms submissions by visitor's IP address over a custom time range.
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WP Nasa/ADS Query Importer
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ChannelSale: WooCommerce Plugin to Sync Multi-Marketplace Product Listings
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qTranslate-X & Yoast SEO
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ChimpBridge – Create and Send Mailchimp Campaigns in WordPress
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Categories For Gravity Forms
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What If Bitcoin?
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Sell License Key Codes with WordPress PHP-KeyCodes
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BMI Calculator by Calculator.iO
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GP Additional Links
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Options View
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IP & Country Blocker Lite
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Ultimate Searchable Accordion Lite – WPBakery Page Builder Addon
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Docu
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Multi Image Upload
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Generic Stats
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Fabrica Dashboard
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Floaty Header – Sticky Header, Floating Bar & Announcement Bar
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WP-Socialight
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Subscriptions for WooCommerce by Sublium
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Admin Optimizer – Performance, Security & Site Cleanup