Zenith Information Systems, Inc
- Provides provide consulting and computer services to the business management and financial communities.
- http://www.zis.com/

Zonar Corporation
- Specializes information engineering, system integration and software development.
- http://www.zonar.com/

Zeidman Consulting
- Provides contract development for hardware and software, engineering consulting and tools for engineers.
- http://www.zeidmanconsulting.com/