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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 project did not use any game engine- only the CE C libraries.
Source Code: https://github.com/EverydayCodeNet/GENESIS-X-CE
You can have a look at https://github.com/Vogtinator/nGL, which is also targeted at calculators, but slightly more powerful ones.
NOTE:
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Hence, a higher number means a more popular project.