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While Cisco Systems' core development areas continue to be in routing and switching, it also provides advanced technologies such as IP communications, application networking services and network security.
Convergys Corporation provides clients in over 70 countries with relationship management, outsourced customer and HR management products, as well as consulting, professional and billing services.
IBM, whose businesses include software, storage, servers and services, has also ventured into new areas such as environmental, social networking and "cloud computing" technologies.
Best known for its Windows operating system and application software, Microsoft continues to ramp up efforts in the online search business.
While it is best-known for its flagship product Oracle database, the company also makes tools for database development as well as middle-tier, ERP, CRM and SCM software.
Best known for its ERP software, SAP has a workforce of about 51,400 people in over 50 countries who serve more than 76,000 customers worldwide.
Siemens IT Solutions and Services provides a range of IT services, from consulting to system integration, right through to the management of IT infrastructures.
A proponent of open systems and Unix, Sun Microsystems is also a major contributor to open source.
Founded in 1968, Tata Consultancy Services is one of the oldest providers of IT and business process outsourcing services in India.
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