IBM is spending $33 billion to acquire Red Hat, pledging to maintain the Raleigh, N.C., pioneer's legacy of innovation on open-source software that can be run across computing platforms. IBM, which has its headquarters close by Greenwich in Armonk, N.Y., trumpeted the deal announced Sunday as helping Big Blue push a vision of a "hybrid cloud" paradigm in which businesses can run their software applications over the internet for access from any device, as well as within their own information technology infrastructure. Red Hat stockholders are getting $190 for each share, which closed below $117 on Friday and spiked by more than half Monday morning to $172.