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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.
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SensorCraft
Programming tools to inspire kids to learn to program in a "world of blocks" similar to Minecraft environment
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Not really a REPL, but can inject code into a running minetest instance: https://github.com/Quiark/mtrepl/
The workshop repo has detailed instructions you can follow: https://github.com/lambdaisland/witchcraft-workshop :)
Awhile back I looked into creating a Jupyter kernel for LDraw/LeoCAD to build LEGO creations with code in the input cell of a notebook and render to the output cell, and put together some notes on Jupyter kernels: https://github.com/westurner/wiki/blob/master/bricklayer.md#...