Rasm is a cross-platform assembler for the Z80 processor developed by Edouard Bergé (Roudoudou).

An executable was available for MS-DOS and Windows. The manual is available in English and French.

Homepage: http://www.roudoudou.com/rasm/index.php
Forum : http://www.cpcwiki.eu/forum/programming/rasm-z80-assembler-in-beta/