Patreon Button and Plugin allows you to add Patreon Buttons to your content and sidebars, along with offering other Patreon functions.
Referral System for WooCommerce. Each customer has referral link that rewards them with a coupon after someone makes a purchase through their link
Simple widget that displays the current status of a fundraising goal.
A fully customisable fundraising thermometer with PayPal integration, custom skins and support for multiple vertical and horizontal thermometers.
The core plugin for WPSponsorship, it allows users to invite their friends to your site via E-mail