Rule SystemsWarriors of the Red Planet (POD) (Blog)
Grim Tales (HC) (Forum)
- Adventure: Slavelords of Cydonia
MARS (d20 PDF) (Savage Worlds PDF) (Savage Worlds HC)
- Amazing MARS PDF bundle, including main rulebook plus seven adventures, a sandbox, and a miniatures combat supplement to Showdown. All for $9.99.
Peril on the Purple Planet
- An upcoming DCC boxed adventure and setting set.
- A science fantasy sandbox setting for Lamentations of the Flame Princess.
Adventures on Dungeon Planet (PDF/POD)
- This is a science fantasy supplement.
Crawljammer -- this fanzine has resources for running DCC as a Spelljammer-style science fantasy campaign.