3) International Business Machines (IBM) – $24.1 billion

Popular worldwide as IBM, this global technology and consulting conglomerate earned revenue of $99.75 billion, out of which $24.1 billion was from software. IBM has been consistently deriving 25 to 30 percent of revenue from software. It manufactures and markets computer hardware and software, and offers infrastructure, hosting and consulting services in areas ranging from mainframe computers to nanotechnology.