I don't really have much to say here, if your definition of "successful" means giant console release with a multi-million dollar budget, then obviously I can't

I don't really have much to say here, if your definition of "successful" means giant console release with a multi-million dollar budget, then obviously I can't say anything because the console manufacturers all ban open source on their platforms. And making a giant list of every small open source game I've ever played is not something I have time to do right now. There are a lot of them. Many of them I've found just because they are side projects that people post on HN.