Kickstarter - Kickstarter is the world's largest funding platform for creative projects. A home for film, music, art, theater, games, comics, design, photography, and more.
SocialEngine - Socialengine PHP: Elevating Your Online Community Experience.
FreeFunder - Free crowdfunding platform with no platform fee and donates to your fundraiser based on shares!
phpFox - phpFox is a powerful social network platform for niche communities
Give - A WordPress plugin for easily collecting donations
BuddyPress - WordPress social networking in a box.