I actually have a mapping software I was looking for and finally found again, next edition I'll throw it in there. This is actually a mapping program used by GBA Fire Emblem modders, if I remember right, so it's definitely helpful. The square dimensions work seamlessly with Roll20.
I'll include a link to it within the PDF next update I do. I'm also working on adding Supports, downtime activities (tea time, training, etc.), and alt rules to accommodate infinite durability (ala Fates / Engage) and rules similar to those from even TearRing Saga and Berwick Saga.
https://feuniverse.us/t/fe-map-creator-also-generates-random-maps/563