Z8E is a full-screen symbolic debugger for the Z80 CPU, known from the former CP/M User Groups.

Main features:

• Screen-oriented.
• Animated debugging.
• Z80 and Z180 versions.
• Auxiliary terminal support.

The current version is 4.2, which fixes an obscure bug that affected reading of symbol table files that ended exactly at a record boundary without an explicit end-of-file character (a valid CP/M condition).

More details here.