Well, in Gimp there is a Filter>Render>Pattern>Hex Grid script-Fu that someone wrote. I recently added it to my system but it does not do the numbering. I imagine if someone knew how the code worked or tracked down the dev they could add that in. Might ask RobA about that though. I haven't ever looked at the scripting in Gimp. Been too busy just trying to learn what it already has.

Seeing as it's already generating the hex lines I don't imagine it would be that impossible to add numbers.