This page is dedicated to how to change and create software. It will concentrate on CVS and Perforce.

scmbug: http://www.mkgnu.net/?q=scmbug
Interesting CVS tool called CVL for Mac: http://www.sente.ch/software/cvl/#License

Graphing tools:
http://wingraphviz.sourceforge.net/wingraphviz/ is based on http://www.graphviz.org/