What software do I need to do this?

[Mark Oliva]

I have a very weak eye and have an immense amount of trouble lining stuff up on tiles by myself in Autorealm, Fractal Mapper 8, and Dungeonforge.

I think it's just a question of your not having learned how to do it yet in Fractal Mapper 8, because it hardly could be simpler than there:

1) Click the menu option Map.
2) Click the option Grids.
3) Set the grids to the scale size of the stamping symbol.
4) Click the menu option Map again.
5) Click the option Snap-to-Square-Grids
6) That's it. Start stamping.

If the first stamped symbol is too big or too small, resize it as desired. The following stamped symbols all will be of the new size.