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InfluxDB
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If you have all the pose estimation stuff figured out and just want to use it to drive a virtual tracker, you'll be looking at creating a driver.
I think OpenVR-driver-for-DIY is an example that emulates an HMD and two controllers, without needing a physical device at all, and would likely be good place to start.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.