The Transactions of the Royal Martian Geographical Society was a Space: 1889 fanzine that has since gone defunct. A good number of articles from the magazine are now available online at the Heliograph site.
Cloudships of Mars is a set of free wargames rules based on the excellent Space: 1889 universe. The Cloudships game features ships propelled by steam and sail gliding high above the plains of Mars thanks to the magic of “Liftwood.”
Space 1889 was/is one of my favorite RPG settings. Here’s a short film/teaser set in the 1889 universe.
I loved Space: 1889. The setting was fantastic, and I also liked the RPG system. But for those who prefer a more nuts and bolts operation, you could try this GURPS conversion for Space: 1889