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gromit-mpx
Gromit-MPX is an on-screen annotation tool that works with any Unix desktop environment under X11 as well as Wayland.
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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 use Gromit-MPX. With it you can toggle "painting mode" with a hotkey (e.g. F9), making your screen essentially a big whiteboard on which you can draw in various colors and thiccnessess.
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