Amberworld is (going to be) an interpreter for the Amiga classic Ambermoon (by Thalion) and games with a similar engine (Dragonflight, Amberstar, Albion). This project needs support, looking for an 680x0 assembler geek.
Adebug/Assemble is a pair of Debugger/Assembler for the MC68Xxx family running on Atari and Amiga computers. Years ago commercial product, now GPL.
Yet Another GB-Z80/Z80/6502/65C02/6510/65816/HUC6280/SPC-700 Multi Platform Cross Assembler Package