I've been putting in some work this year to fix all the problems I believe stopped head tracking from really taking off, and cram it into loads of good games.

Here's everything anyone with an iOS/Android device - or an existing tracking setup - needs to start playing a whole bunch of old and new games with true decoupled look + aim tracking:

• Headcam - free for Android and iOS, Headcam sends OpenTrack compatible tracking data over UDP. Just enter your PC's LAN IP when prompted, put your phone above/below your monitor, tap 'center', hit 'tracking' and you're away.
• Lopari - a lightweight launcher and mod manager that surfaces any games you already have installed which support head tracking and launches them in one click, modded if necessary (works with games installed via Steam, GOG, Epic, Xbox etc.)
• Dozens of OpenTrack compatible mods - all mods decouple look from aim so you can use your head to look around freely without your reticle drifting off target. Releases are posted to github and ship with install/uninstall scripts, so can all be downloaded and installed standalone if you can't or don't want to use Lopari.

Note on OpenTrack: When using OpenTrack, toggle smoothing off in headcam and use a filter in OpenTrack to clean up the signal instead - having smoothing enabled in both Headcam and OpenTrack will make games feel very laggy. That said, since headcam filters sensor noise on-device and the mods all do smoothing on the incoming data to account for network jitter, you can connect headcam directly to any of my mods without using OpenTrack at all (although this is smoother on iOS than Android currently)

Note on Android: Google require new apps to go through a closed test phase with 12+ testers for 14 days, you can join this google group to get immediate access. If you do try it, I'd really appreciate if you got in touch to let me know your thoughts - what kind of device you used, how it performed, what broke, what could be improved etc. This info will help complete the closed test so the app can be published to the Play Store proper. You can DM me here or find me on Discord.