It is MMO FPS, ahh not free.
OP's Options
Dungeons and Dragons unlimited
Lord of the rings online
Allods Online
Runes of Magic
not any free mmofps games to my knowledge, most are not even worth the time and effort (excluding GW)
Did you play it? it might have FPS-style combat but it is most certainly not an MMOFPS, go play planetside if you want one of them.