Nzmon is a reverse hack of an old S.D.Systems monitor program. The original functions have been updated to include bank switching logic, a .hex file download, and a far more extensive floppy disk interface that the original. It uses the Zilog SIO/2 serial chip for the system console.
Cbios.mac is a preliminary CBIOS written for a 10MHz Z80 prototype that I am building.
AZ80 is an M80 "wannabe" that is written in C and is highly portable. It DOES NOT produce .rel files or do .phase/.dephase. It does produce .hex files. A make file is included, and it has been ported to DOS (Borland C) and all sorts of Sun boxes. It also works quite well with Linux/gcc.
Disas is a disassembler written in C that has a similar port history to AZ80.
Here is a copy of the Cross asm/disasm tools (see above) that have been rewritten to understand the Z180 instruction set in addition to the Z80. Again, they are an easy port to Linux.
Here is a zip file with the content of the last release of the Vedit software (v. 1.39). It was extracted from an .IMD image of a SSSD 8" distribution diskette.