Apps similar to xmessage include Zenity, which is free and open source. Other options are Modern Message Box Generator, Yad, KDialog and whiptail. You can choose from more than 10 Shells like xmessage for Linux, Windows and Mac.
Xdialog is designed to be a drop in replacement for the "dialog" or "cdialog" programs. It converts any terminal based program into a program with an X-windows interface. The dialogs are easier to see and use while adding even more functionalities (e.g.
Gtkdialog is a small utility for fast and easy GUI building. It can be used to create dialog boxes for almost any interpreted and compiled programs which is a very attractive feature since the developer does not have to learn various GUI languages for the miscellaneous...
