graph visualization software

Hello,


I'm an undergrad working on a research project and I am responsible for
the graph visualization. I am new to all of this and am spending a lot
of time researching the various tools available, such as graphviz and
daVinci. I am still reading many topics in newsgroups, so I am sorry
if this question is redundant, but I wanted to know if anyone could
recommend a well-documented tool which has the following capabilities:


- A way to control part of the graph layout (like assign certain
vertices to specific layers and then minimize the number of crossing
edges)
- Interactive
- Easy to incorporate within the system (C++) and have a feedback
between the visualization and the rest of the system
- Add numerous attributes to edges/vertices for the display
- Free and/or open source
- Display potentially large graphs (10^7-10^8 vertices) in reasonable
time
- Easy to have a GUI for it


Any feedback on this would be great.
Thanks,
Hilary

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