Melting Point is a GURPS setting I made a while ago, set on a poorly terraformed Mars where the societal elite of old cloistered into near-impenetrable dome cities while being tended to their every want and need by a class of softly modified humans which acted as a servile underclass. These cities still needed labor and resources their rather meek servants couldn't supply, which left a parallel society of surface-dwellers on Mars who scraped out a harsh living mining ice, minerals and doing intensive agriculture in more hospitable areas.
It was a somewhat hard-ish sci-fi setting with some extensive human gene-editing leading to a few posthumans running around, along with things like magnesium flash-bulb pumped laser weapons and flexible armor made of ferrous panels in a magnetic suspension to harden against impact sites and distribute energy when struck. Most people got by with things we'd consider contemporary.