Liberapay is an open source payment platform that enables users to easily and securely accept donations, receive and manage payments, and create and manage crowdfunding campaigns. It is an online payment processor that allows individuals and organizations to collect donations and payments from their supporters. Liberapay is free to use and is an open source platform, which means that anyone can contribute to its development. It allows users to collect payments from their supporters and provides them with a variety of tools to manage, track and report donations. Liberapay also provides users with a comprehensive set of analytics and reporting tools to help them understand their donor base and track their progress. Additionally, users can customize their campaigns and donation pages and control the way donations are received and processed.
It is also a way to set up recurring payments for various purposes.
Flattr
BountySource
Patreon
Open Collective
Ko-fi
FreedomSponsors
Tipeee
beerpay
SubscribeStar
Steady
Partelo
Maecen.com
Tip4Commit
Clica.net
MakerSupport
Cloud Patron
BountySource allows you to be specific about the donation, you can donate specific features (problems with github).