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AmberELEC
Handheld firmware optimized for the Anbernic RG351P/M/V/MP, RG552 and other compatible devices.
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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.
The only down side to Amberelec is that you can't customize it as much as ArkOs with things like updating Retroarch cores but that stuff can become very time consuming anyway. https://amberelec.org/
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.