My go-to game is Chain of Command from TooFatLardies. I have not suggested it because it has about one platoon per side and is thus too low-level to be an alternative to FoW. Now, however, TFL has released a free 13-page PDF on how to play bigger CoC games. Suddenly, you can just play CoC with your FoW army out of the box!
So many toys, so little time.