I'm working on one, sorta.
I've got the map part done, mostly. (The artwork for the towns is incomplete)
I've got most of the town stats done. There's a snag here because the upkeep costs for towns aren't open content. So the user will have to enter them themselves.
But as I just got La Pucelle: Tactics, I probably will spend all my free time playing that (in fact, I should be playing it now), so who knows when I will finish. If there happen to be any VB 6.0 programmers out there who want to take over for a while, or just want to see the source, drop me a line and I'll send it to you (I was going to release the source code as open content, anyway)