Binary package “gromit-mpx” in ubuntu focal
GTK+ based tool to make annotations on screen with multiple pointers
Gromit-MPX enables you to make annotations on your screen using
multiple pointing devices at once.
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This is especially useful when making presentations, to highlight
things or point out things of interest.
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Gromit-MPX is XInput-Aware, so if you have a graphic tablet you can
draw lines with different strength, color, erase things, etc.