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pegasus-frontend
A cross platform, customizable graphical frontend for launching emulators and managing your game collection.
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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.
The app itself is quite good, but not as practical or functional as Lutris is or Steam, but you can give it a chance (you can use Proton/Wine, emulators, native, with it). If you download the Appimage format it doesn't need even any install (just make the file executable an run it). The main repo is in GitHub -right here-
Then are another front-ends, but are more specialised on emulation, and usually they don't have straight integration for Windows games, I don't know if in your use case are useful. If is the case I can think about Pegasus. It can import data from other launchers/front-ends and use scrapers for resources, maybe even Luanchbox is covered but I don't know for sure (look for Pegasus plugins).