wp.insider

affmngr

This addon allows you to specify a MailChimp list name in the addon settings. When affiliates join your site, they get signed up to the specified MailChimp list automatically.
This addon requires the <a href="https://wordpress.org/plugins/affiliates-manager/" rel="ugc">Affiliates Manager Plugin</a>.
After you install this addon, go to the MailChimp settings interface and specify your API Key and the MailChimp list name.
Read the following page for step by step usage documentation: 
http://wpaffiliatemanager.com/signup-affiliates-mailchimp-list/

Affiliates Manager MailChimp Integration

An addon for the Affiliates Manager plugin to signup the affiliates to your MailChimp list

rajasekharan

This plugin is used to create new autoresponder subscribers in WP Autoresponder automatically when a new subscriber is added to any one of the levels in the s2member membership website plugin.

s2member to WP Autoresponder Integration Plugin

Plugin to create new subscribers in WP Autoresponder when new members of s2member are created.

Affiliates Manager MailChimp Integration vs s2member to WP Autoresponder Integration Plugin