ATasm is a 6502 command-line cross-assembler that is compatible with the original Mac/65 macro assembler released by OSS software. The aim of ATasm is to provide Atari home-brew coders with a comfortable and powerful toolset.
ZASM is a 2 pass assembler for Zilog's 8-bit CPU Z80.
Supported platforms: Unix-style OS, e.g. MacOS X, Linux, BSD.
Special support for ZX Spectrum emulator file formats.
Binary or intel hex file output.