Headcam - head tracking & streaming app (iOS) [video]
Turns your iPhone into an OpenTrack webcam with surprisingly low latency.

TV-first media server with Apple companion apps, but Plex and Jellyfin already solve this.
Apple users who want to stream personal videos to their smart TV
Plex · Jellyfin · Infuse
Then you have the iOS and macOS apps that you can use to upload your videos to the TV. Other than uploading and file management, you can control the playback and stream the videos from the TV back to the iOS and macOS app and even switch the playback back and forth between the large screen and the iOS/macOS device like with handoff.
It works pretty well.
Turns your iPhone into an OpenTrack webcam with surprisingly low latency.
Metal sphere rendering with GPU color conversion, but panorama players already exist.
Live outdoor audio over local Wi-Fi beats sleep apps' fake recordings; genuinely novel constraint.
Elixir backend is cool, but the mini-games look generic.
Finally mocks AVCaptureSession in the Simulator without private APIs or device tethering.
Metal-based CRT shaders with 8 presets bring authentic retro feel to modern Macs.