Open-source software—finally—is reveling in its own renaissance era on Wall Street. In its first life, circa 2009, the would-be movement was dogged by salacious headlines featuring a familiar name, one-time Goldman Sachs programmer Sergey Aleynikov, and themes of theft, crime and misappropriation. Over the last decade, this perception has been all but overwritten. The world’s biggest sell-side institutions have gone from skeptics (if not outright naysayers) to some of the most active