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Plasma-window-decorations
Window styles for KDE Plasma highlighting the active window in the color scheme's accent color
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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.
Also. I don't know if it helps you, but there is ActiveAccentFrame. It put a color border around active windows. Can be installed from Get new thing for Windows Decoration in Settings.
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