xsv is fantastic. I'm a longtime user and fan of csvkit but I've slowly switched some of my habitual usage to xsv. Note that csvkit -- not being a single program like xsv but rather a collection of utilities -- contains a few branches of functionality that xsv doesn't aim to replicate, namely csvsql (convert CSV into SQL create and insert statements) and in2csv (convert XLS and JSON to CSV).

I hadn't seen that tool, thanks for pointing it out.