dobelx64 is an interpreter for the DOBELA esoteric programming language, written in x86-64 assembly language — specifically, the FASM dialect.
It was largely an exercise in x86-64 assembly and the ELF format. Every byte in dobelx64 is either the translation of an assembly instruction I wrote, or was otherwise inputted by me directly, and no library functions are called. Apart from the FASM assembler and the C preprocessor (to avoid hard-coding some magic numbers related to system calls), no compilers nor linkers are involved in the build process.
As a result, dobelx64 is very non-portable. Beside requiring an x86-64 or compatible processor, it runs only on Linux — though some BSDs might also be capable. Only Linux has been tested.
Both a pre-built binary and the source code are available here: