Rackspace Inc. is a managed cloud computing company based in Windcrest, Texas, USA, a suburb of San Antonio, Texas. The company also has offices in Australia, the United Kingdom, Switzerland, Israel, and Hong Kong, and data centers operating in Texas, Illinois, Virginia, the United Kingdom, Australia, and Hong Kong. The company's email and apps division operates from Blacksburg, VA; other offices are located in Austin, Texas and San Francisco, California.
Salesforce.com is a cloud computing company headquartered in San Francisco, California. Though its revenue comes from a customer relationship management product, Salesforce also tries capitalizing on commercial applications of social networking through acquisition. As of 2015, it is one of the most highly valued American cloud computing companies with a market capitalization of $50 billion, It is listed on the New York Stock Exchange and is a constituent of the S&P 500 index.