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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.
Well, we developed the plugin months before Google stopped selling the viewers :) Anyway the project is not dead at all: Google is actively developing the new SDK (https://github.com/googlevr/cardboard) and since few years the Google viewers weren't the most selled ones.
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.