Is it possible to use Notepad++ as a sort of IDE for Graphviz?
GVEdit that comes with Graphviz is very inadequate for editing. Notepad++ has already solved many code-editing problems elegantly, but unfortunately there is no "compile this DOT file and show me the result" button in Notepad++ to enable a quick compile/edit cycle.
I made a plugin for the purpose of a quick compile/edit cycle in Notepad++: https://github.com/jrebacz/NppGraphViz, scroll down to the installation section for instructions.
The plugin takes the current tab's document, sends it to a selectable Graphviz layout program (like dot.exe), and displays the resulting image in a preview window. F9 will refresh the window.