WSO

WSO may stand for:

WSO2

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, like the digital e-Government of Moldova.

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 is one of the few middleware vendors to provide what is termed a complete middleware stack and notably the only vendor to open-source such an offering. 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 and other sources as being one of the leading competitors in the application infrastructure market.