Hi! None yet, just GrapheneOS for now. But there are a few in early production I'd like to try - I'm guessing that'll be for my next phone. If Google locks alternative app stores out of Android, a lot of people may be needing to make a switch. When I got a degoogled phone, I was pleased to see many of the apps I'd been using all along were open source. It made the transition way more pleasant. So I might as well start building the apps I want on my next one!