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Hercules
Hercules, Hercules page, Hercules/390: the New Users Documentation Effort, MVS 3.8J Technical Resources, Running Classic Operating Systems with Hercules, Yahoo! Groups : hercules-390, Your Private Mainframe
FLEX-ES
System/390 on Intel-based servers.
IBM Mainframe Computer Time to Rent
Systems include OS/390, VM/ESA, and VSE/ESA.
Soft390
System/390 on IA64-based servers.