Ask HN: Recommended tools for creating apps that render to both native and web?

Are any of you familiar with any nice tools which enable creating apps that render to both native + web views?

Can you give me the scoop on what is going on in this space?

I recently saw facebook's "react native".

The whole html-inlined-into-your-javascript thing really put me off initially.

Is anyone really using this for their commercial production applications?

Are there other similar competing solutions or technologies worth considering as alternatives?

Thanks! Waka