PeopleSoft consulting, performance tuning and education. Specializing in z/OS DB2 implementations of PeopleSoft software.

Datatask's computer-based training for z/OS and VSE/ESA.

CD-ROM-based training containing 36 mainframe OS/390 courses. Includes one z/VM course.

Based in Vienna, Virginia, specializing in TPF (Transaction Processing Facility) consulting.

EDS’ managed mainframe services provide you with a spectrum of mainframe IT solutions for the IBM z/series platform in a data center environment. Includes managed services and IT mainframe outsourcing.

HDS offers both vendor-neutral and HDS-specific education worldwide, much of it relevant to their mainframe storage and software products.

HTS offers consulting services, contract consulting and Staff augmentation. Provides mainframe consulting services and application development.

Mainframe (z/OS, z/VM, VSE/ESA and zLinux) and open systems data center outsourcing services, including disaster recovery and business continuity with an emphasis on hospital and insurance organizations. An Amalgamated Life company.

Mark Lillycrop's UK-based company offers IT research, writing and marketing services, specializing in business continuity, security, service management, storage and mainframe data center strategy in Europe and the U.S.

z/OS classroom courses and Datatrain mainframe computer-based training, mostly in English, in the Netherlands and Belgium.