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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.
Valve staff is also aware they cannot force developers to retrofit 16:10 support into existing games (some do, many don't), so they even go the extra mile to provide extra functionality in gamescope to improve the 16:10 gaming experience for games that only support 16:9 natively.
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.