Software developer Red Hat bought an Israeli company in a bid to gain a competitive edge against Microsoft and smaller rivals that provide computing services for complex networks. Raleigh, N.C.-based Red Hat said Thursday that it paid $107 million in cash for privately held Qumranet, which sells software that helps computer systems run multiple programs more efficiently on less equipment. The acquisition continues Red Hat’s David vs. Goliath narrative of chipping away at Microsoft’s global dominance gained through its proprietary Windows operating system.