[qazxcvbnm]

I second Miller - besides its extensive support for various formats, it is fast. If you ever have to deal with gigabyte-sized files, Miller will give noticeable speed ups versus jq et al.

[mattewong]

FYI: https://github.com/BurntSushi/xsv is much faster than mlr (like an order of magnitude), and zsv (https://github.com/liquidaty/zsv) is even faster. But, neither support formulas. Disclaimer: I am one of the zsv authors