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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GA4WP – Analytics Dashboard for the Website
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Toggleable Admin Bar
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Custom Post Type Attachment
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RSS Chimp – Add Featured Images to WP RSS Feeds (Mailchimp, Google News, Feedly)
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Simple Page Redirect
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WP Sponsor Flip Wall
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Grey Admin Color Schemes
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SUBRE – Product Subscription for WooCommerce – Recurring Payments
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Easy SEO Toolkit
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Bulk Content Toolkit
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Catch Breadcrumb
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Real Estate Fix & Flip Calculator
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Order Calendar for WooCommerce
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HT Security
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Content Publisher for Confluence – Sync & Embed pages
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Lifetime Subscriptions for WooCommerce
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UM Infinite Scroll Member Directory
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GeeK! – Movie & Game Database
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Excerpt Tools
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Surbma | Divi & Gravity Forms