Concrete Angels (2004)

from the introduction:
Concrete Angels is a roleplaying game set in the grimy, gritty world of crime fiction (especially those found within Andrew Vachss' "Burke" series of novels and Frank Miller's Sin City). The City is a dark and dirty place where crime runs rampant. Hookers and junkies lurk in the alleys like rats, the Mob runs City Hall and the cops are either corrupt or burned-out. The characters are con men, pushers, thieves, call girls and hustlers. But being on the wrong side of the law doesn't make you a bad guy. It just makes you more careful.

from Word on the Street:
Concrete Angels first appeared as a free game called Sex & Violence. I rewrote most of it to incorporate the mechanics of Matt Snyder’s game DUST DEVILS. The inspiration for that Sex & Violence (and this one) is Frank Miller’s “Sin City” and Andrew Vachss’ Burke series of novels (as well as his other books and stories). Neo-noir and crime fiction may be popular genres but Miller and Vachss are two of its masters.

This game is available as a free download.