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Last I heard, the node guys were quite adverse at maintaining both node-v8 and node-spidermonkey. I don't blame them ;)

And that doesn't help that the people who started node-spidermonkey left Mozilla and afaik can't contribute to open source projects that are not explicitly vetted by their current employer.

I'd rather see the node-servo version ;)

As far as I understand, Servo will come with a WebKit embedding API, so the possibilities are pretty much endless.

Servo uses spidermonkey as JS engine, so I don't think it brings anything in a "run js headless" context.

Although it's possible that some of the changes required to integrate Spidermonkey and Servo might make the former easier to embed?

True, but mostly because writing a JS engine from scratch is hard although not impossible.

Sadly dead - https://github.com/zpao/spidernode