Here are a few links you may want to check out -- S-P-O-N-G-E is a good one in particular. Drop me a line if you want me to add you site.
S-P-O-N-G-E Cthulhu website
Steve Jackson Games' GURPS
Delta Green modern Cthulhu
Into the Darkness: GURPS Black Ops
Gunmetal Blue: GURPS over the top action