GTK+ 3 Reference Manual
Display Widgets
GtkAccelLabel
— A label which displays an accelerator key on the right of the text
GtkImage
— A widget displaying an image
GtkLabel
GtkProgressBar
— A widget which indicates progress visually
GtkStatusbar
— Report messages of minor importance to the user
GtkInfoBar
— Report important messages to the user
GtkStatusIcon
GtkSpinner
— Show a spinner animation