which coins use this algorithm? i see they call it "marucoin" algorithm in sph-sgminer, but is marucoin the first coin to use it or only the most famous coin?
Yep it's marucoin. it's the same as X11 it just has 2 additional sph algos (hamsi and fugue). By the way, once you earn enough from the donations (which I have nothing against), consider contributing some of your improvements to sgminer (
https://github.com/sgminer-dev/sgminer/tree/v5_0). Since it would not be possible to do this without sgminer (or cgminer in the first place), it is nice to give something back from time to time. Cheers!