Based on our record, Tip4Commit seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Also obvious, and also only one way - sites where repository maintainers ask for feature implementation with a reward. There is no obvious winner here, both sites are good. - BountySource — payments in USD, seemingly more requests - Tip4Commit — payments in BTC, smaller amount of requests but payments are quite bigger. Source: about 3 years ago
Softagram - Automated visual reviews for GitHub pull requests
Flattr - Help the open and free web flourish. Support creators by paying for their free content.
BountySource - BountySource is a funding platform for open-source bugs and features.
Liberapay - Liberapay is a recurrent donations platform.
Goteo - Goteo is an open network for crowdfunding, collaborations and training, leader in social innovation. With 2 rounds and fiscal advantages for donors!
Patreon - Patreon enables fans to give ongoing support to their favorite creators.