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Description
Obviously if you're going to write an operating system using jQuery, you're going to need JavaScript. And to get JavaScript running, you need an engine for it.
Duktape was built for this. It's incredibly small, and can be easily integrated with any C setup.
V7 is another good choice. It's only ~200kb.
The only argument against these is that they aren't using JIT, which could be a problem if you were to have something big running on them, i.e. an OS. V8 would be a great choice for JIT, though it's a lot larger.