ACME is a free crossassembler. The current version can produce code for the 6502, 65c02 and 65816 processors. It also supports some of the undocumented ("illegal") opcodes of the 6502. This software runs on several platforms, currently there are versions for: AmigaOS, DOS, Linux/general Unix, RISC OS and Windows. ACME knows about global and local labels, global and local macros, conditional assembly and looping assembly. It can include other sourcefiles as well as binaries while assembling, does offset assembly and much more.