mkhexgrid is a small command-line program which generates hexagonal grids
of the sort used for strategy games. Hex grids can be created as PNG or
SVG images, and as PostScript. Virtually every aspect of the output can be
be adjusted.from grid line thickness and color, to style and size of hex
centers, to the style and position of hex coordinates. mkhexgrid makes it
simple to create whatever hex grid you need.

WWW: http://www.nomic.net/~uckelman/mkhexgrid/