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ncurses textmode version.
Homepage: https://www.invisible-island.net/dialog/dialog.html
Newt is a programming library for color text mode, widget based user interfaces. Homepage: https://pagure.io/newt
Gnome or GTK version. Homepage: Gitlab: https://gitlab.gnome.org/GNOME/zenity
Fork of Zenity with more parameters and features.
KDE or Plasma version of the dialog utility:
Homepage: https://develop.kde.org/docs/administration/kdialog/
GitHub: https://github.com/KDE/kdialog
kdialog --title "YesNoCancel warning dialog" --warningyesnocancel \ "About to exit.\nDo you want to save the file first?"