itthinx

This plugin integrates <a href="http://www.itthinx.com/plugins/affiliates/" rel="nofollow ugc">Affiliates</a> with <a href="http://www.quirm.net/" rel="nofollow ugc">eShop</a>.
With this integration plugin, referrals are created automatically for your affiliates when sales are made through eShop.
The plugin allows you to set a referral (commission) rate so that your affiliates get credited with a referral based on a percentage of each sale’s total net amount.
Affiliates allows you to maintain your own affiliate program to boost sales through your online store powered by eShop. This is what you need:
<ul>
<li><a href="https://wordpress.org/extend/plugins/eshop" rel="ugc">eShop</a></li>
<li><a href="https://wordpress.org/extend/plugins/affiliates" rel="ugc">Affiliates</a></li>
<li><a href="https://wordpress.org/extend/plugins/affiliates-eshop-light" rel="ugc">Affiliates eShop Integration Light</a> (this plugin)</li>
</ul>
Install these, set up your shop, set the referral rate for affiliates and distribute your affiliates their affiliate links. Whenever an affiliate refers a client to your store and the client makes a purchase, you will see a referral created for the affiliate.
eShop Test Mode
Please note that in eShop’s Test Mode, no referrals are recorded.
Feedback is welcome! 
If you need help, have problems, want to leave feedback or want to provide constructive criticism, you can leave a comment here <a href="http://www.itthinx.com/plugins/affiliates-eshop-light" rel="nofollow ugc">at the plugin’s page</a>.
Please try to solve problems there before you rate this plugin or say it doesn’t work. There goes a lot of work into providing you with free quality plugins! Please appreciate that and help with your feedback. Thanks!
You are welcome to <a href="http://twitter.com/itthinx" rel="nofollow ugc">follow me on Twitter</a> for updates on this and related plugins.

Affiliates eShop Integration Light

This plugin integrates Affiliates with eShop.

Freemius

olegabr

Allow your affiliates to create posts and pages on your site. Then if customer visits your site starting from these pages it will be counted as if they came by an affiliation link of the corresponding page author.
<ul>
<li>Dramatically improve your site’s search position.</li>
<li>Make your site a central point of marketing materials, guides and articles for your store.</li>
</ul>
<h4>Free Features</h4>
The <a href="https://wordpress.org/plugins/affiliates-manager/" rel="ugc">Affiliates Manager</a> plugin is supported out of the box.
<h4>PRO Features</h4>
The <a href="https://wordpress.org/plugins/yith-woocommerce-affiliates/" rel="ugc">YITH WooCommerce Affiliates</a> plugin is supported out of the box.

Guest Author Affiliate

Allows your site's content authors to become your affiliates.

Affiliates eShop Integration Light vs Guest Author Affiliate