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MicroPython
MicroPython - a lean and efficient Python implementation for microcontrollers and constrained systems
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Nim
Nim is a statically typed compiled systems programming language. It combines successful concepts from mature languages like Python, Ada and Modula. Its design focuses on efficiency, expressiveness, and elegance (in that order of priority).
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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.
I mean that really depends on implementation. You have stuff like micropython that is targeting MCUs and it fits in almost nothing.
And, you get Nim
NOTE:
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Hence, a higher number means a more popular project.