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steamdb
JSON file of all games available on Steam with prices and additional data from Steam Spy, GameFAQs, Metacritic, IGDB and HLTB.
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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.
This is the first link that came up when I simply Google'd this...
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.