MemberPress ActiveCampaign GPL Overview:

ActiveCampaign is a complete email marketing automation and CRM platform with a visual editor that allows you to build powerful email workflows. With our add-on, you can assign your members different lists based on which Membership they’ve purchased.

ActiveCampaign allows you to reach and engage your audience using precise targeting, nurture and educate users by providing tailored guidance, and provide well-timed calls to action that inspire your audience members take the next step.