1 Graphviz is a set of graph drawing tools from AT&T Research and Lucent Bell
5 - dot: makes hierarchical layouts of directed graphs
6 - neato: makes "spring" model layouts of undirected graphs
7 - lefty: a programmable graphics editor
8 - dotty: a customizable interface written in LEFTY
9 - tcldot: a customizable graphical interface written in TCL
10 - libgraph: the base library for graph tools
11 - various associated utilities