The developers of
Pasmo, an open-source Z80 cross-assembler have released a pre-version the upcoming Pasmo 0.6, which is intended to be used for testing purpores, or for those who would like to help in development. The new version was completely re-written in
Bison and can now also assemble 8080 code instead, or mixed with, Z80.
Relevant link:
Pasmo website