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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'll grant you that it can be a bit hard to keep track of everything. I used Playnite for a while to organize everything I had installed: https://playnite.link/ After a while though I went back to using the individual launchers and my own shortcuts. I've been playing games on PC since the 1990s though, well before Steam or any other modern launchers were on the market, so I'm used to having a de-centralized collection of games.
Friendly PSA that you can add your Prime Gaming library to your GOG Galaxy launcher through this: https://github.com/Rall3n/galaxy-integration-amazon
This is the one that's working for me. Instructions for installation are included in the readme.