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renode
Renode - Antmicro's open source simulation and virtual development framework for complex embedded systems
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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.
If you're open to using Zephyr RTOS for your project, I've heard Renode is a fantastic option. https://renode.io/
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.