BountySource - BountySource is a funding platform for open-source bugs and features.
Patreon - Patreon enables fans to give ongoing support to their favorite creators.
Gitpay - Add bounties to solve Git issues from projects.
Tipeee - "Tip" the creators you like.
Designbook - What do all startup founders need? More time, passionate collaborators and investors!
Liberapay - Liberapay is a recurrent donations platform.