SASM

SASM (Scriptable ASseMbler) is a x86 assembler with ECMAScript as (additional) macro language as an optional compile-in-option

Features

Support for x86-16, x86-32 and x86-64 targets
- since 2015, it's based on the opcode tables from the NASM project, before 2015, the whole x86 ISA code generation was hardcoded
Supported output formats:
- BIN
- COM
- MZEXE
- PE32
- PE32+/PE64
- ELF32
- ELFX32 (untested)
- ELF64 (works, but some small non-critical issues are still there)
- COFF32
- COFF64
- OMF16 (Work in progress, non-existent/only-stub)
- OMF32 (Work in progress, non-existent/only-stub)
- TRI32 (TRI = Tiny Runtime Image, a simple object in-memory file format, designed for usage in just-in-time compilers and so on)
- TRI64 (TRI = Tiny Runtime Image, a simple object in-memory file format, designed for usage in just-in-time compilers and so on)
- and of course RUNTIME, where the assembled code can run directly after the assemblation, so it's also a runtime x86 assembler.
1024-bit big integer parsing and arithmetics
Floating point number literal parsing up to inoffical 512 bit FP data formats.
And many more features . . .

Delphi or FreePascal as compiler for to compile SASM itself
PUCU.pas from https://github.com/BeRo1985/pucu for unicode handling stuff
Optional together with SASMBESEN as define: BESEN*.pas from https://github.com/BeRo1985/besen