Webdot Graph Server - http://www.research.att.com/~north/cgi-bin/webdot.cgi/
Webdot is a server program that converts graphs described in the DOT abstract graph description language into GIFs that can be included in HTML pages. The graphs can contain mouse-sensitive nodes simply by giving the node a URL attribute, so there is no need to worry about x-y coordinates
Webdot can serve a graph from a (dot source) in more than one format:
text/plain(dot source)
image/gif
text/plain(imagemap)
application/x-pcl
application/x-hpgl
application/x-dot
application/pdf(PDF)
application/postscript(PS)
application/postscript(EPSI)
application/x-tcl(Tclet)
application/x-mif(FrameMaker)
x-world/x-vrml(VRML)
application/x-vtx(VisualThought)
By StephenNorth - http://www.research.att.com/~north/