SAP is the leading provider of enterprise resource planning (ERP) software used to integrate back-office functions such as distribution, accounting, human resources, and manufacturing. The backbone of SAP's products has been its On-Premise offerings, spearheaded by its Business Suite, which includes ERP and customer relationship management (CRM) software, among others. Year founded: 1972 Revenue: $17.6 billion (2014) NYSE: SAP

Microsoft develops, manufactures, licenses, supports and sells computer software, consumer electronics and personal computers and services. Its best known software products are the Microsoft Windows line of operating systems, Microsoft Office office suite, and Internet Explorer and Edge web browsers.Year Founded: 1975Revenue: $93.6 billion (2014)NASDAQ: MSFT

Oracle is a leader in enterprise software and provides hardware and services to help companies improve their processes. Best known for its focus on databases, it offers aid in areas such as managing business data, collaboration and application development, customer relationship management, and supply chain management. Year founded; 1977 Revenue: $38.2 billion (2015) NYSE: ORCL