--- a/README.txt	Fri Apr 12 01:17:29 2013 -0700
+++ b/README.txt	Fri Apr 12 01:47:19 2013 -0700
@@ -143,7 +143,8 @@
 Python packages related to graphs:
 
 * graph-tool: http://en.wikipedia.org/wiki/Graph-tool ,
-  https://pypi.python.org/pypi/graph-tool
+  https://pypi.python.org/pypi/graph-tool ,
+  http://projects.skewed.de/graph-tool/
 
 
 External libraries and tools
@@ -152,9 +153,13 @@
 * tulip: http://tulip.labri.fr/TulipDrupal/
 * GUESS: http://graphexploration.cond.org/
 * Java Universal Network/Graph Framework : http://jung.sourceforge.net/
+* graphthing http://graph.seul.org/
+* igraph http://igraph.sourceforge.net/
 
 See also http://k0s.org/links/?q=graph
 
+(And what is
+https://github.com/tinkerpop/blueprints/wiki/GraphML-Reader-and-Writer-Library ?)
 
 Parallel Efforts
 ----------------