Ophis is a cross-assembler for the 65xx series of chips.
It supports the stock 6502 opcodes, the 65c02 extensions, and syntax for the "undocumented opcodes" in the 6510 chip used on the Commodore 64.
Ophis is written in pure Python and should be highly portable.
Ophis is a command-line application, and as such, you will need to edit your environment to put the Ophis install directory into your path.
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