Graphviz
Beautify Edges
Edge Attributes
URL arrowhead arrowsize arrowtail color colorscheme comment constraint decorate dir edgeURL edgehref edgetarget edgetooltip fillcolor fontcolor fontname fontsize headURL head_lp headclip headhref headlabel headport headtarget headtooltip href id label labelURL label_scheme labelangle labeldistance labelfloat labelfontcolor labelfontname labelfontsize labelhref labeltarget labeltooltip len lhead lp ltail minlen nojustify penwidth pos samehead sametail showboxes tailURL tail_lp tailclip tailhref taillabel tailport tailtarget tailtooltip target tooltip weight xlabel xlp