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• (AU) Oakton Computing Pty Ltd - Offering a wide range of IT consulting services.
• (AU) Open System Consultants Pty Ltd - Consulting, software development, technical writing and training services for WWW, Unix, Motif and C++.
• (AU) Open Systems Technology Pty Ltd
• (NZ) Optimation - Specialising in infrastructure management, network integration, security, e-commerce, application development and performance testing.
• (AU) Orion Solutions - PC hardware/software sales and service, consulting, OS/2, NT, Win95, DOS support, JAVA support/programming, system consolidation and administration.

• OAO Corporation
• Object Resources, Inc - Cmainframes, AS/400, UNIX, relational databases, GUI.
• Object Sciences Corporation
• Objects Worldwide, Inc. - Provides on-site consulting, off-site fixed projects, and offshore development.
• Octec Ltd - Image processing, automatic tracking, weapon control, and alignment systems.
• OES
• Off the Wall Productions - Providing Macintosh consulting, music production, web site design, and Internet connection services.
• Ohm Networks - Works with businesses to set up web-based training programmes, converts paper documents into secure electronic documents, and offers desktop multimedia conferencing solutions. Also offers online courses.
• OLLY, Ltd. - Information technology consultants.
• Omega Systems - Consulting firm committed to addressing all facets of computer, data communications, and information science technology.
• Omicron - Consulting services for client/server and Internet based applications and networks.
• Omni Resources, Inc.
• Omni Systems, Inc. - An 8(a) certified systems information engineering consulting firm.
• Omnia Consulting, Inc. - Full service information technology and business consulting company.
• On Point Technology Inc. - Providing solutions for the employment security community.
• Onepax - Onepax is a consulting firm that specialises in hardware, software, and web design services for businesses and individuals within the United States.
• Open Object, Inc - Offers a full range of Java and Internet training, consulting and development services.
• Open Systems & Networks, Inc. - Network, systems, and database consulting services.
• Open Systems Group - Network and applications consulting firm specialising in Windows and Unix platforms.
• Open Technology Group, Incorporated - Specialises in analyzing, evaluating, and identifying the best information technology solutions.
• Opensoft - Information technology consulting and recruitment company.
• Optimized Computer Solutions
• Optimos - Services include ERP, CRM, eCRM, document management, and e-commerce applications.
• Orban Computer Consulting
• Orbex
• orbitworld.net - Offers access, hosting, and design services.
• Orbtech
• Orga Card Systems Ltd. - Smart card manufacturer for communications, finance, health, leisure, loyalty, retail, security, and transportation.
• Orion Group Software Engineers, Inc. - HP Systems Integrator providing hardware, software, and consulting services.
• Orion Technology - IT and systems engineering consulting services firm providing wireless high-speed Internet services for high-density residential communities.
• Ortia - Offers software development consultancy.
• OSC S.A. - Decision Support System (DSS/EIS), Data Warehouse, and OLAP techniques.
• Outsource IT - Full and supplemental IT units, network services and security, cabling, project planning, and customised hardware for industrial and commercial applications.