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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 licensing raises an interesting question into whether it's fair or confusing to advertise this as an open source game. The game logic code is open source (Under a vague GPL license, needs to be GPLv2 compatible due to engine license) but most of the other assets are under a "CC-BY-NC-ND 4.0" license hence not open source themselves.
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.