High-Quality USB Head Tracker Clip - #1 DIY Choice
Opentrack | heise Download
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Head Tracker Opentrack Camera IR LED Track Clip Pro - Etsy
1.4.1] KerbTrack v1.5: Head tracking using your webcam, TrackIR, Oculus Rift, joystick (2018-03-14) - Page 12 - KSP1 Mod Releases - Kerbal Space Program Forums