Donate this feature is a platform that looks similar to Github’s project board. But additionally every feature has an estimation on how much money it costs. So if a user suggests a new feature, he can also submit the amount of money he will be able to donate. Other users, that find this feature useful, can follow with their donations. Once the donation pot is equal or higher than the estimation, the developer of the project will implement the feature and get the money.
This approach might be more efficient than a donation option for the whole project, as the theoretically value some gives for certain features might be higher than he would give in general measured over one year.