Thanks, PlaneS - that tool really is not bad. It won't let me define the size of the map, as well as it's graphics don't look as neat as the ones from "Hex World Creator", but however it provides a nice interface to work with. I think I will prefer that one before "HexMapper".
@Trance: Well, it's v0.50b - I'll be looking around for a newer version, but have not found one yet. (sadly, a lot of websites who provide downloads or links to such mappers are already dead)
However, thanks for the hint, I wouldn't have looked for newer versions prior to this.

(and also thanks for the listing of hex-field types in "Blood"

)
[edit]
Okay, there's definetively a v0.90b out, if not even 0.93 ... but I have failed to find a working download so far. Even the creator's website seems to be dead. :/
[edit2]
Well, been happy too early. I've found a working download, installed it and ... yet the same problem. Crashes as soon as I try to fill the map with water.
Best of all, I think v0.93 is the one I already had, since there aren't any differences, and in the readme it still says 0.50b which is why I thought the version I already had could be outdated...
oh well :|