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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.
If you want to try something practically free with not too bad tracking quality you can check out april tag: https://github.com/ju1ce/April-Tag-VR-FullBody-Tracker
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