- Zarb Consulting
 - Strategic communications consulting to further national health IT adoption. Marketing initiative management for EHR vendors, associations, and other health IT stakeholders.  ZEDA Applications Management, Development & Support
- UK-based IT outsourcing company delivering managed application services, systems integration, and software testing on legacy and current platforms.- Zeducorp
- Professional consulting firm for web database development and targeted marketing services.
- Zeidman Consulting
- Provides hardware and software design for all sizes of companies at all stages of the development process.
- Zeitech
- Information consulting and high tech contractor placement service.
- Zenith Information Systems, Inc
- Zonar Corporation
- Specialises information engineering, system integration and software development.
- Zytek Inc.
- A network computer systems integrator. Develops and installs document imaging solutions for data entry, archiving and workflow applications.
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