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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.
https://vittorioromeo.info/quakevr , https://github.com/SuperV1234/quakevr
https://www.halflifevr.de/ , https://github.com/maxvollmer/Half-Life-VR , https://www.reddit.com/r/HalfLife_VR
Take a look at the releases page, it mentions VR support there.
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.