An informal association of mainframers run by Arcati Research, with monthly newsletter and breakfast sessions in London or Oxford, England. Membership is free.

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.

MMIS is Barry Graham's mainframe hardware and software negotiation consulting practise, including the periodicals Mainframe Market Monitor, Mainframe Market Bulletin and Enterprise Data Center.