As of January 15, 2020, there is an official Gravity Forms EmailOctopus integration. Please read the announcement post.
This plugin will no longer be updated or supported as of 2020-02-01. Please use the official Gravity Forms add-on for EmailOctopus for updates and support.
This plugin provides an easy way to integrate EmailOctopus with Gravity Forms
Read my full guide here: Integrating EmailOctopus with Gravity Forms.
Please note that this is a third-party plugin and is not affiliated with EmailOctopus or Gravity Forms.