GtkCanvas is a straight port of the GNOME Canvas from the stable gnome-libs 1.2.4 back to gtk+. This widget behaves identically to the GnomeCanvas widget, with the same APIs, except the names are changed from gnome_canvas to gtk_canvas. Since the next version of gtk+ will drop GdkImLib and intgrate with gdk-pixbuf, it is expected that future versions of this widget will depend upon gtk+ only. It is intended that GtkCanvas will follow GnomeCanvas closely, merging new code whenever a stable release of the latter is made. Thus this is not really a fork but rather a "re-packaging" of the same code.
GtkDatabox is a widget for the GTK+ library designed to display large amounts of numerical data quickly and easily. It allows for one or more data sets of thousands of data points (X and Y coordinates) to be displayed and updated in split seconds. It offers the ability to zoom into and out of the data, and to navigate through your data by scrolling. In addition to rulers and a simple coordinate cross, it allows you to add one (or even more) configurable grids like on an oscilloscope. Data may be presented as dots, lines connecting the data, or vertical bars. The widget allows you to easily transform pixel coordinates into data coordinates, thus allowing you to easily create powerful applications for data analysis.
GtkEditor is a source code editor widget for GTK+. It is currently used, in one version or another, in several GTK+/GNOME applications, including gIDE, VDKBuilder, and GXEdit. The gtkeditor widget sub-classes the gtktext widget, and after initialization, the editor widget can be treated as the usual text widget, and all source-code editing features are taken care of by the widget itself. The behaviour of the editor is decided by dynamic libraries loaded during initialization of the widget. These libraries can be hand-coded or (in the future) created using tools supplied with GtkEditor.
GTKExtra is a useful set of widgets for creating GUIs for the X Window System using GTK+. It is written in C and includes the following widgets: GtkSheet, GtkPlot, GtkPlotCanvas, GtkItemEntry, GtkComboBox, GtkColorCombo, GtkBorderCombo, GtkFontCombo, GtkDirTree, GtkIconList, GtkFileList, GtkIconFileSelection, and GtkCheckItem.
GTKML (GTK Markup Language) is an XML format for defining GTK user interfaces, including dynamically-bound events. Advantages include easier development, incorporating UI changes without recompiling, interoperability between GTKML-compliant language bindings/frameworks and editors, and end-user customizations/internationalizations. GTKML provides a cleaner organization than GLADE, and is much better suited for use with object-oriented languages. For a C++ binding to GTKML, see the SDPGTK library.