- 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.
- Offshore Advisor
- Helps small and medium businesses capitalize on the global services economy. Find top offshore outsourcing companies for web design, software development, and BPO.
- 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.
- 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 Systems Technology Pty Ltd
- 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.
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