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gamescope
Discontinued SteamOS session compositing window manager [Moved to: https://github.com/ValveSoftware/gamescope] (by Plagman)
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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.
Great homework but you miss the most important tool in my opinion, gamescope.
I use QEMU for virtualization, but you might as well know about virt-manager for desktop GUI use.
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.