[k3n]

Underscore CLI looks interesting as well, though I haven't personally had much of a chance to play with it. It does require NodeJS, which might be a deal-breaker for some, but if it's already in your toolchain then it might come in handy.

https://github.com/ddopson/underscore-cli

[daxelrod]

I've written a similar tool underscore-cli and jq called jowl. It's designed to be easier to learn (for JavaScript developers) than underscore-cli or jq. The README includes a comparison.

It's still early in its development, and would benefit from a tutorial and a few more features, but it's getting there.

https://www.npmjs.com/package/jowl