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zephyr
Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.
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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.
Regrading image size there was an issue made by some doctorates comparing the performance of Zephyr with other rtos. Some top contributors responsed https://github.com/zephyrproject-rtos/zephyr/issues/32875
Maybe Nuttx can be an alternative. Have a look: https://nuttx.apache.org/
Look at Embox (https://github.com/embox/embox). It can run on EFM32ZG with 32kB ROM 4kB RAM
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