Patreon - Patreon enables fans to give ongoing support to their favorite creators.

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.

Ko-fi - Ko-fi offers a friendly way for content creators to get paid for their work.

Clica.net - Clica.net is a membership platform based on Bitcoins. You create your page and receive your fans.

Cloud Patron - Open source Patreon alternative

Liberapay - Liberapay is a recurrent donations platform.