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SteamUI-OldGlory
A set of customisable Steam Library tweaks, with an installer. Also a reference that you can use to learn how to make your own tweaks.
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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.
It isn't an overlay. It's MacOS + enforced transparency on Steam window (back image leaks) + Steam White Skin of some sort combined. Steam Overlay is the dialog box you see when you hit Shift+Tab.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.