No criticism to the author. He is way more productive than I will ever be, but xsv does appear to be on the back burner. Open source means the author can spend their time how they like and I am entitled to nothing.

readme says this tool is originally a fork of BurntSushi's xsv, but has been nearly entirely rewritten at that point, to fit SciencesPo's médialab use-cases, rooted in web data collection and analysis geared towards social sciences (you might think CSV is outdated by now, but read our love letter to the format before judging too quickly). xan therefore goes beyond typical data manipulation and expose utilities related to lexicometry, graph theory and even scraping.