  This review paper surveys recent development in software implementations for
extreme value analyses since the publication of Stephenson and Gilleland (2006)
and Gilleland et al. (2013), here with a focus on numerical challenges. We
provide a comparative review by topic and highlight differences in existing
routines, along with listing areas where software development is lacking. The
online supplement contains two vignettes providing a comparison of
implementations of frequentist and Bayesian estimation of univariate extreme
value models.
