Science Fantasy

Carcosa was mentioned in the OP. I own Xulan and have read planet Eris.

I like Crimson Sun except that I want to roll d20.

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Thanks! So you may not like my next suggestion which uses only 1d6 but I still recommend checking it out: Ray Otus’, Sorcerers and Sellswords captures some great science fantasy genre tropes in a really tight ruleset (1 page).

While hunting around in Drive Thru, I just found this: Warriors of the Lost Planet - Weird Realm Games | DriveThruRPG.com
A Tekumel adapter for Warriors of the Red Planet.

I never really got into the setting of Tekumel even after reading Man of Gold but Warriors of the Red Planet is superb.

And to show my commitment to the genre as well as my continued ability at shameless self-promotion, I did a sword & planet hack of World of Dungeons called Planet of Adventure!
(also 2d6)