Ninja Forms GetResponse GPL Extension Overview:

GetResponse Addon for Ninja Forms lets you conjoin user’s according to thine Campaigns of GetResponse using Ninja Forms

Add users in conformity with GetResponse Campaigns to the usage of Ninja forms. You perform create infinite types yet place that somewhere about the site. Each shape can have extraordinary Campaigns as let’s ye Gather customers according to extraordinary Campaigns of GetResponse.

Additionally, thou be able also to map the custom fields with Ninja Forms Fields.