Thank you TattooedMac! I'm gonna check it out. I almost give up at mac OS this month cause I'm finishing my thesis and I just bought a MB and I'm having trouble to get used to this OS.Is yGraph a graph editor ??
Anyways i found THIS
yED Graph editor
yEd is a very powerful graph editor that can be used to quickly and effectively generate drawings and to apply automatic layouts to a range of different diagrams and networks.
yEd is available as a free download with unrestricted functionality!
yEd makes full use of the yFiles library. This is a Java class library enabling the viewing, editing, optimizing, drawing, and animating of a wide range of diagrams, networks, and other graph-like structures.
yEd has been built using 100% lightweight Swing components. This allows it to run on any platform where a suitable Runtime Environment is available.
Might be something you looking for
Cheers