by WP connect on WordPress.org
Connect Gravity Forms to Brevo (Sendinblue). Sync form fields with Brevo attributes and automatically generate contacts in specified lists.

Plugin Settings page
Connect the awesome WordPress Gravity Forms plugin to the relationship marketing platform Brevo (ex Sendinblue). With this game-changing plugin, you can link any Gravity Forms field with Brevo attributes. When validating the form, you generate a contact in the selected list(s) with all the correct attributes according to the information entered.
Double opt-in only available with Pro version.
Add a personalized note only with Pro version.
This is the free version of our Gravity Forms to Brevo plugin.
Gravity Forms to Brevo Free allows you to create up to one feed for each form, map an Email field with a Brevo email attribute and one Consent field with a boolean attribute. You can also send new contacts to a single Brevo list. The free version does not include unlimited feed creation, multiple field mapping, selection of multiple lists, or the double opt-in option.
If you need more, check out Pro version to unlock all features.
If you need some assistance, open a ticket on the Support.
If you generate a list while creating an unsaved feed, an error may pop up during the process. Save your feed before reloading the page and your list will appear. To avoid the inconvenience, create your list before your feed.
Make sure all your Brevo attributes are generated before liking them with Gravity Forms form fields. If you can’t see them, wait a minute: your lists and attributes are cached for optimal performance.
Ticket via the WordPress support forum