Savage Barsoom are rules for playing games set on Edgar Rice Burrough’s Mars using Pinnacle’s Savage Worlds game.
Legends of Dying Mars is a set of free skirmish rules for playing games set in the classic Edgar Rice Burroughs John Carter of Mars Barsoom setting.
EGBZine is an online archive of more than 10,000 pages of Edgar Rice Burroughs goodness — stories, articles, art and more. If you’re contemplating (as I am) a John Carter of Mars game, this is a good place to start.
It seems that back in the 1930s, the son of Edgar Rice Burroughs set out to create a cartoon series based on his father’s John Carter of Mars series of novels. Unfortunately, the series never got off the ground. Some initial work on the series survived, however, and you can see it in the YouTube video below: