[Question] can you give a small overview over variants/relations?

[LowLevelMahn]

its unclear for me what are the different forks and which is to prefere - can you enlighten me what you JWasm fork/port is about and what you think about the other forks

there is: https://github.com/JWasm/JWasm (last change 2 months ago)

this one: https://github.com/Baron-von-Riedesel/JWasm (last change 5 days ago)

and UASM - which seems to be based on JWasm: https://github.com/Terraspace/UASM (John Hankinson seems to have less and less time for maintainance)

UASM is currently my prefered assembler for re-assembling IDA pro disassembly (because its very near to and needs less fixes compared to MASM etc.) - and your JWasm release seems to be creating the very same binary code compared to UASM, what make it a good alterantive candidate for the future :)