I've been working on MeshLive, an open-source app for voice/video calls and livestreaming over Bluetooth mesh without internet. Nearby phone relay to extend the range.

Started with Android, but now have iOS, macOS and Windows versions too. Android app just went live on the Play Store after months of work. Still pretty experimental, but it's been fun getting live video working over BLE.

https://github.com/MeshLive