"Tome of Secrets" has a "Warlord" class that's halfway between the Marshal and the 4E Warlord. Also, the APG has the "Cavalier" that has some Marshal-ish abiltities. But the Marshal is closed content, so there aren't any "official" ports.
There's some discussion of this over at Paizo, as well...
The company is more commonly listed as Super Genius or SGG, but I second Jadeite's recommendation. I find the war master to be a perfect Pathfinder-marshal, and better designed than the original to boot.