VimPlugin: Drawit
From wikinotes
Drawit is a plugin that lets you draw diagrams from within vim. I was thinking that is might be useful while taking notes.
While you're in Visual Block mode, you can block out a chunk and use '\a' '\b' '\l' and others to convert the selection into another type of drawing.
Usage
\di " enter draw-mode \ds " exit draw-mode (arrow-keys) " draw (hjkl) " move without drawing space " remove character Ctrl v " visual block \a " arrow \l " line \b " box i " insert a word