--- a/x.rst	Tue Dec 13 17:23:24 2011 +0200
+++ b/x.rst	Sat Dec 17 22:27:32 2011 +0200
@@ -12,6 +12,54 @@
 
   http://www.tronche.com/gui/x/icccm/
 
+Widget toolkit.
+===============
+
+  http://en.wikipedia.org/wiki/Widget_toolkit
+                Widget toolkit
+  http://en.wikipedia.org/wiki/List_of_widget_toolkits
+                List of widget toolkits
+
+GTK+.
+-----
+
+  http://en.wikipedia.org/wiki/GTK%2B
+
+QT.
+---
+
+  http://en.wikipedia.org/wiki/Qt_%28toolkit%29
+
+WxWidgets.
+----------
+
+  http://en.wikipedia.org/wiki/WxWidgets
+
+Tk.
+---
+
+  http://en.wikipedia.org/wiki/Tk_%28computing%29
+
+FLTK.
+-----
+
+  http://en.wikipedia.org/wiki/FLTK
+
+Xaw.
+----
+
+  http://en.wikipedia.org/wiki/Xaw
+
+GNUstep.
+--------
+
+  http://en.wikipedia.org/wiki/GNUstep
+
+XView.
+------
+
+  http://en.wikipedia.org/wiki/XView
+
 Getting info about X window and X-related applications data.
 ============================================================