Check out Utopia: Type Final - it is post-apocalyptic blend of fantasy and sci-fi... however, I will admit it is entirely PvP and not RP focused. It does boast an incredible level-less system, however. At least, I think so. : p
Also, you should take a look at Awakened Worlds. It is shadowrun based, which is a level-less system. It blends RP and PK very, very well - for an RP-focused MUD, that is. The PvP is straight-forward and not incredibly complicated, but it is quite sci-fi and enjoyable. I especially enjoy the quests the game has to offer.
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