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.
More Plugins
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FolioBlocks
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Floaty Header – Sticky Header, Floating Bar & Announcement Bar
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Rating Widget: Post Rating, 5 Star Rating, Reviews, Thumbs Up & Down, Reaction
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Subscriptions for WooCommerce by Sublium
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WPFTS Add-on for WP Download Manager
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Liane Form
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Dynamic Year Block – display a copyright notice in your footer with the current year
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WPC AJAX Search for WooCommerce
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AJAX Read More
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User Toolkit
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RaveCapture Reviews For Woocommerce
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Max Upload File Size Manager
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Yappa Widget
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Protect Admin
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TinyMCE Color Picker
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Dolutech Blacklist Protect
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Simple Accessible Spoilers
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Remove WooCommerce Billing Address Fields for Free Checkout
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Content Protect By Time Lock
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Post to Chatwork