Modding tools for Fe 3, 4, or 5?

I have an interest in the different fe games and their different styles and flavours, but I find that I enjoy them most when I have the power to change up the levels (what and how many units, music, weapons, stats).

Febuilder has fe6-8 covered, paragon has fe9,10,13,14 and 15 support, but I would like to know if there are any editors for any of these fe games.

I use the Nightmare editor for Snes fe. It’s far less advanced than FEBuilder but it gets the job done.

How easy would it be to add many green units?

It shouldn’t be that hard from what I can remember, but I haven’t used it in some months, so I can’t give specifics. Won’t work in fe3 though since I don’t think that game has green units.

I have used the nightmare tool a long time ago, and from what I remember, I could only place units down as long as I have slots in the editor to fill (which is not much, specially free slots that are not taken by enemy units).