I’ve authored the CIRT package for R, for the joint analysis of responses and response times on (educational) tests. This package is not supported anymore by me (I’m out of this research field for some years now and therefore lack the affinity). However, my colleague Jean-Paul Fox has developed the R-package LNIRT, together with his coworker Konrad Klotzke, that includes the functionality of the former CIRT package. It is on CRAN, and can be found here: