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Playnite
Video game library manager with support for wide range of 3rd party libraries and game emulation support, providing one unified interface for your games.
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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.
I always hoped that some Hero Coder will develop a Steam plugin for http://playnite.link/ which will also use SteamCMD but with the acceptable and most functional looks of PlayNite with-Out the bloatware Steam became as of this update. As long as no one tries to breach the Steam-DRM, all of above told are allowed because Valve is the only developer friendly store to offer their own code also on https://github.com/ValveSoftware (not the protection ones obviously).
However, Steam has been long offering https://developer.valvesoftware.com/wiki/SteamCMD (command line, no UI) as an alternative to normal Steam Client so you can install that (replaces the current) and add either https://github.com/dmadisetti/steam-tui or https://github.com/DioJoestar/SteamCMD-GUI that uses SteamCMD but offers a functional UI, the alternative you're seeking for.
However, Steam has been long offering https://developer.valvesoftware.com/wiki/SteamCMD (command line, no UI) as an alternative to normal Steam Client so you can install that (replaces the current) and add either https://github.com/dmadisetti/steam-tui or https://github.com/DioJoestar/SteamCMD-GUI that uses SteamCMD but offers a functional UI, the alternative you're seeking for.