Charitable is a powerful, extendable fundraising plugin that gives you full control over your website donations.
Patreon Button and Plugin allows you to add Patreon Buttons to your content and sidebars, along with offering other Patreon functions.
WP Crowdfunding is a WordPress plugin for fundraising/backer sites. This WooCommerce based plugin lets you launch a site like Kickstarter easily.
Unify WPML translation versions of a crowdfunding campaign so that contributions to each language version count towards the main campaign.