Hercules - An open-source emulator of S/370 and ESA/390 which runs under Linux on a Pentium PC. - http://www.conmicro.cx/hercules/
Linux for S/390 - Official Linux on S/390 site with links and downloads. - http://oss.software.ibm.com/developerworks/opensource/linux390/
Linux Resource Management and OS/390 Expectations - Resource Management means applying ACL quotas on all computing resources, as OS/390 users are used to doing. Linux (and Unix) has some RM capability being worked on. - http://shearer.org/en/writing/resourcemanagement.html