GTK+ 3 Reference Manual
Selectors (Color/File/Font)
GtkColorButton
— A button to launch a color selection dialog
GtkColorSelectionDialog
GtkColorSelection
— A widget used to select a color
GtkHSV
GtkFileChooser
— File chooser interface used by GtkFileChooserWidget and GtkFileChooserDialog
GtkFileChooserButton
GtkFileChooserDialog
GtkFileChooserWidget
GtkFileFilter
— A filter for selecting a file subset
GtkFontButton
GtkFontSelection
GtkFontSelectionDialog