- ACTS Corporation
 - Strategic IT consultants, education for MVS/ESA, OS/390, OpenEdition, SNA, TCP/IP, Unix, DB2, S390 and Parallel Sysplex. - Ada Byron Company
- Offers mainframe consulting services, including Pacbase, Cobol, and DB2.
- AIG Technologies
- Supplier of IT consulting services, specialising in insurance software, data centre outsourcing, and managed operations.
- Alicomp
- Provides mainframe IT services including outsourcing, systems programming support, and design, installation and maintenance services.
- Alternative Maintenance Solutions
- Specialising in mainframe computer maintenance services for Unisys, Storagetek, EMC, HP, Dell, and IBM systems.
- Blue Hill Data Services
- Provides complete outsourcing solutions for mainframe data centre processing.
- DevTech Associates, Inc.
- Our purpose is to target the needs of our clients by providing unique, cost-effective solutions.
- ECHO Associates, Inc.
- Offers TPF consulting providing people to the transportation and finance industries.
 Elmbronze Ltd.
- We supply analysis and programming for IBM Mainframe Legacy Systems in Cobol PL/1 Assembler and PLAS.- Infocrossing, Inc. (1)
- Kisco Information Systems
- Consulting services for the IBM Midrange market. Includes a full array of utility systems for the IBM AS/400 and IBM System/36 systems.
- Martec Computer Services
- Provides IBM mainframe data centre outsourcing services including MVS, OS/390, zOS, and Multiprise 3000.
- Mentor Consultants, Inc
- Norwich Research
- I.T. development and suppport company, specialising in mainframe credit card systems. Experts in CardPac, Vision21, and VisionPLUS.
- Quantum Consulting & Placement
- Consulting, recruiting search and placement company. Offers unique consulting opportunity to top consultants with mainframe and client server technologies.
- Remote Programming, Ltd
- Provides mainframe application support via the Internet.
- Responsive Systems Company
- Services range from the evaluation and selection of micro, mini, and mainframe computers and software, through providing technical and management studies, and technical education.
- SofTech Consulting
- Representing expertise in system and software development from the largest mainframes to the smallest PC applications.
- Techsys Resources
- Specialises in mainframe-based operating systems consulting and integration, remote technical support, and systems software development.
- Transaction Design, Inc.
- Conducts computer capacity and performance studies.
- Transition Systems Corporation
- Management consulting that provides application programming and systems engineering support for mainframe and client/server platforms.
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