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Arduino_FreeRTOS_Library
A FreeRTOS Library for all Arduino ATmega Devices (Uno R3, Leonardo, Mega, etc).
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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.
FreeRTOS is supported on the AVRs, but it's not clear if it supports Arduino boards well. There is a (less popular/maintained) fork of FreeRTOS for Arduino boards. Unless you are using the "bigger" boards, I would stay away from FreeRTOS on the small boards (Uno, Nano, etc) just based on the fact that it doesn't seem to be "mainstream", so you are likely to be the first person to encounter bugs.
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.