--- a/README.txt	Tue Apr 23 10:38:58 2013 -0700
+++ b/README.txt	Tue Apr 30 19:35:21 2013 -0700
@@ -157,9 +157,9 @@
 * http://arborjs.org/
 
 
-External libraries and tools
+Other external libraries and tools:
 
-* Graphviz
+* Graphviz: the old, the venerable, and still the king
 * tulip: http://tulip.labri.fr/TulipDrupal/
 * GUESS: http://graphexploration.cond.org/
 * Java Universal Network/Graph Framework : http://jung.sourceforge.net/
@@ -167,6 +167,15 @@
 * igraph http://igraph.sourceforge.net/
 * blockdiag: imple diagram images generator; http://blockdiag.com/
 
+Let's not forget
+* ganv: Ganv is an interactive Gtk canvas widget for graph-based
+  interfaces;
+  http://dev.drobilla.net/browser/trunk/ganv (though see also
+  http://packages.ubuntu.com/source/quantal/libs/ganv and
+  http://harryhaaren.blogspot.com/2012/12/getting-to-grips-with-flowcanvas.html
+  ) 
+
+
 See also http://k0s.org/links/?q=graph
 
 (And what is