WSO2 (sometimes stylized as WSO2) is an open source technology company providing service-oriented architecture (SOA) middleware. It is best known for its Enterprise Service Bus, API management, governance and analytics offerings, some of which are notably used by eBay, Boeing, Experian and others. WSO2 was founded by Dr. Sanjiva Weerawarana and Paul Fremantle in August, 2005, and has been backed by investment from Intel Capital, Toba Capital, Pacific Controls and others. As of 2015, WSO2 has offices in USA (Mountain View, CA; Bloomington, IN), UK (London) and Sri Lanka (Colombo), with the bulk of its research and operations being conducted from its main office in Palm Grove, Colombo. The company rose to prominence after eBay revealed that a key element of their transaction processing software used the open source WSO2 ESB. WSO2 products are released under the Apache License Version 2. Like the Apache project itself, WSO2 follows open development principles and airs architecture and development discussions public mailing lists. The company is noted by Gartner as being one of the leading competitors in the application infrastructure market.