All of them are open-source on GitHub, check Skibidi.cash for links. First two have a working .apk you can test today and third place can be tested locally.
Discussion
I saw this but I was asling if the apk are somehow usable or just proof of concept/too buggy to use. Was lazy to try myself, I got already dozens of wallet apps installed "just to try it".
I wouldn't call them production ready but #1 is pretty close to that and it's fully functional. It's a hackathon after all, hoping some of them continue to develop their projects.