Binary package “gsimplecal” in ubuntu mantic
lightweight GUI calendar application
gsimplecal is a lightweight calendar application written in C++
using GTK3.
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It was intentionally made for use with tint2 panel in the openbox
environment to be launched upon clock click, but can be bound to
some hotkey in any window manager.
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gsimplecal can be configured to not only show the calendar, but
also display multiple clocks for different world timezones.