Graphviz can easily be used as a backend layout system to output SVG or PNG. It'...

dreamcompiler on Sept 10, 2018 | parent | context | favorite | on: D3-dag – Layout algorithms for visualizing directe...

Graphviz can easily be used as a backend layout system to output SVG or PNG. It's just not very interactive; you can do mouseover annotations but you can't drag nodes around.