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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.
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MangoHud
A Vulkan and OpenGL overlay for monitoring FPS, temperatures, CPU/GPU load and more. Discord: https://discordapp.com/invite/Gj5YmBb
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gamescope
Discontinued SteamOS session compositing window manager [Moved to: https://github.com/ValveSoftware/gamescope] (by Plagman)
Proton GE github repository.
Feral gamemode github repository.
MangoHud github repository.
Gamescope is also really useful, with it you can scale both native and proton titles with FSR or NIS, set framecaps, and fix broken alt tabbing behavoir in games all with a single utility.
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.