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There is also yasm https://github.com/yasm/yasm which has different goals but doesn't seem to be that active anymore.

IIRC yasm was (is?) also compatible with GNU/AT&T syntax. I remember submitting either a bug report or patch years ago related to that.

Would you happen to know the authors of yasm felt the need to completely rewrite nasm? It's always been confusing to me.

Looking at it not very deeply, seems like yasm is more of a library with a command line frontend, and whereas nasm is built like a program.

Thank you, that's a reason at least.

Alsi it has more debugging formats

It seems to me like they're saying the library approach makes it easier to add features. So there would be one example of more features.

I think the main reason is for supporting both AT&T and Intel syntax at the same time.