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steamvr_unity_plugin
SteamVR Unity Plugin - Documentation at: https://valvesoftware.github.io/steamvr_unity_plugin/
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
The SteamVR plugin for Unity is basically just a wrapper for the OpenVR library, which you can use in anything you want. Here is the license for the SteamVR Unity plugin. According to it, you should be fine.
NOTE:
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Hence, a higher number means a more popular project.