Tysss

Creates a metabox to woocommerce product edit pages with an option to assign a role to user when the product is bought.

PurchaseRoles

Requires Woocommerce. Adds an option to assign a role to user when a specific product has been bought

Marco Canestrari

Plugins Genius allows you to choose which plugins should be active in the frontend and in the backend. 
Some plugins affects only the frontend, some only the backend of WordPress and some of them make WordPress slow.
Now you can tune your WordPress site, actvating plugins only where you need.
<ul>
<li>Author: <a href="http://www.marcocanestrari.it/" rel="nofollow ugc">Marco Canestrari</a></li>
</ul>

Plugins Genius

Role-based active plugins manager. Choose which plugins should be active for each WordPress role in the backend and in the frontend.

PurchaseRoles vs Plugins Genius