Object file converter

This utility can be used for converting object files between COFF/PE,
OMF, ELF and Mach-O formats for all 32-bit and 64-bit x86 platforms.
Can modify symbol names in object files. Can build, modify and
convert function libraries across platforms. Can dump object files
and executable files. Also includes a very good disassembler
supporting the SSE4, AVX, AVX2, AVX512, FMA3, FMA4, XOP and Knights
Corner instruction sets. Source code included (GPL).

Homepage:
https://www.agner.org/optimize/
