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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.
It's a great and influential project none the less and costs as much as a cheap book ($14.99 IIRC).
I'm all for homebrew dev on classic consoles (Mega Drive being my favourite also) yet these fantasy consoles are much easier to program for and usually have more meaningful constraints targeted towards finishing little projects while going solo.
Check out this list of free pico-8 clones, some of which support programming in lisp like languages even:
https://github.com/pico-8/awesome-PICO-8#clones
If someone really wants something with less enforced limitations than PICO, then the TIC-80 [0] fantasy console is fully open source.
[0]: https://tic80.com