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Cole Software's XDC
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The most comprehensive and flexible product available for the debugging of Assembler language programs which execute in the OS/390 (MVS) operating system environments on IBM (and compatible) mainframes.
http://www.colesoft.com/
Systems/Asm
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Dignus' HLASM compatible assembler product for the IBM mainframe. It's available as a native assembler for OS/390 and z/OS, or as a cross-assembler hosted on Windows, AIX, Solaris, FreeBSD, Linux and Linux/390.
http://www.dignus.com/
Forum - Usenet comp.lang.asm370
See also