Star City, Gotham Airfield and Stryker's Gate 6 are part of the Gotham Knights stagepack from The Unlimited, I think. There MIGHT still be a link to them on their forum.
Ghost Rider's stage is on Scruffy Dragon as Cyprus Hill Cemetary.
I have the Aquaman stage; I MIGHT upload it later.
I think the "Lobo" stage is more than likely a Gotham stage (the Batsignal is obscured by Batman's health meter, but I can still recognize it). As for where to download it, the Sky Battle stage and the one with Supergirl in the background....no idea. I may be able to find the Metallo stage for you, though.