Indeed, probably not many. But one of those that seems like it is doing quite well and is in a similar space is Krita. They have a healthy number of contribut

Indeed, probably not many. But one of those that seems like it is doing quite well and is in a similar space is Krita. They have a healthy number of contributors, fund developers, and are making good progress quickly on a powerful application that works very well and has a lot of polish. https://krita.org/en/ https://krita.org/en/