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+-*- mode: outline; coding: utf-8 -*-
+
+* RRDtool.
+
+RRDtool is the OpenSource industry standard, high performance data logging and
+graphing system for time series data. Use it to write your custom monitoring
+shell scripts or create whole applications using its Perl, Python, Ruby, TCL
+or PHP bindings.
+
+  http://oss.oetiker.ch/rrdtool/
+                home page
+
+* Graphviz.
+
+Graph visualization is a way of representing structural information as
+diagrams of abstract graphs and networks. Automatic graph drawing has many
+important applications in software engineering, database and web design,
+networking, and in visual interfaces for many other domains.
+
+  http://www.graphviz.org/
+                home page