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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.
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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
There is a thread on the Gamescope github repo where a dev mentions that they know why the input lag is happening, and seems to think they can fix it:
more info from release page and from github https://github.com/GloriousEggroll/proton-ge-custom/releases/tag/GE-Proton7-24
There's both. This post also mentions the RTSS alternative for Linux (honestly it's even better than RTSS) called Mangohud.