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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 SteamLink itself is quite underpowered, it can not do much standalone. It can still do something! Valve does offer an SDK but does not officially support other apps (AFAIK). So it is up to 3rd parties to port things to SteamLink (or make apps from scratch). For a console-gaming type person installing other apps might be difficult, and there aren't that many apps.
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.