Hey Cartographer's Guild, first time posting.

I need to change my map from mercator projection to equirectangular to be able to edit it in Wilbur, do climate maps etc. I have G.Projector, but the bugger won't accept anything but equirectangular images. I've searched the forums and with google, but haven't found a script or a program to do this for me. Ideal would be either Gimp or Inkscape plugin to do this, but anything that can convert a map projection is fine. Please help Cartographer's Guild, you're my only hope!