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pegasus-frontend
A cross platform, customizable graphical frontend for launching emulators and managing your game collection.
Have a look at pegasus-fe. Works on most OS (windows, macOS, linux, android etc.). It won't download games, but presents them in a very nice and efficient way. It also has many themes. Lastly, you can also launch programs, not only games !
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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project_black_pearl
Unify your game sources in one place and aquire more of them, using modules made by the community.
Hey! You basically described Project Black Pearl
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old-RetroBat-obsolete
Discontinued RetroBat is the best way to play your ROMs collection on Windows !
take a look at www.retrobat.org (if you're into retrogaming). I use it in conjunction with steam big picture mode on my couch machine.