Hey there! This is finally my first post.
I also thought about buying TrackIR but wasn't sure because I wanted to wait for the RIFT.
When I was looking for a low budget alternative I stumbled over opentrack, which seems to
have massively progressed over the past few months so I gave it a try. I'm using it for a
week now and it works great. Definitely not going to buy TrackIR anymore.
My configuration consists of an old Samsung Galaxy SII smart phone strapped to my
Headset which is in flight mode and connected to my system via USB. Bluetooth or WiFi
would also be possible but for connectivity and meltin-my-brain-with-radiation reasons I
chose USB.
Even though it may not be as sophisticated as TrackIR it's for free and worth a try.
If anyone needs help configuring it or needs a profile feel free to ask me.
Here is the tutorial I followed to set it up: (It's not me in the video)
https://github.com/opentrack/opentrack/wiki/Smartphone-Headtracking