snescom is a suite of assembler and linker tools for the 65816 processor, which is used in the SNES. It can produce xa65-compatible relocatable object files, IPS format patches, raw binary images, and ROM images in SMC format.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This release updates the linker program, adding a feature to output raw files, or even ROM files directly in the SMC format, with proper checksums. The error handling of the assembler was improved somewhat.