What is Glade?

Glade is a RAD tool to enable quick & easy development of user interfaces for the GTK+toolkit and the GNOMEdesktop environment.

The user interfaces designed in Glade are saved as XML, and by using the GtkBuilder GTK+ object these can be loaded by applications dynamically as needed.

By using GtkBuilder, Glade XML files can be used in numerous programming languages including C, C++, C#, Vala, Java, Perl, Python,and others.

Glade is Free Software released under the GNU GPL License

Source: Glade – A User Interface Designer