lelinhtinh

WordPress Coupon plugin to promote affiliate coupon and deals on your WordPress site. Free and <a href="https://github.com/lelinhtinh/wp-coupon" rel="nofollow ugc">open-source</a>.

OMS Coupon

WordPress Coupon plugin to promote affiliate coupon and deals on your WordPress site.

Matamko

En Masse is now available for WordPress. This plug-in allows users to install a coupon shopping feature to their website. It allows customers to purchase any types of coupons online and facilitates great management in dealing of the coupons. Its implementation involves a frontend and a backend administrator site, both for the purpose of simplifying the management of coupons and deals.
<a href="http://www.matamko.com/products/en-masse-wordpress/en-masse-wordpress-introduction.html#What_will_you_get" rel="nofollow ugc">view detail…</a>

OMS Coupon vs En Masse WordPress