by bipinbheda54 on WordPress.org
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.

IP Limit settings in the form admin.
The Gravity Forms IP Limit Add-On allows you to restrict how many times a user can submit a form based on their IP address, within a specified number of days.
Features:
Perfect for:
* Preventing form abuse/spam
* Limiting contact form submissions