Hi, Version 0.6.1 of the 'catlearn' package is now available. Catlearn is an archive of formal models of categorization and learning, plus benchmark datasets to test them against. It's also an archive of simulations using those models. It's free and open source software ... and always will be. Version 0.6.1 is a maintenance release with a series of minor enhancements to existing functions. Catlearn is a package for R, and is very easy to install within that environment. Make sure you're running the latest version of R, and then type: install.packages('catlearn') and then library(catlearn). For a tutorial introduction to catlearn, and the Open Models initiative more generally, see Wills et al. (2017). There is also information here: https://ajwills72.github.io/catlearn Thanks to all the contributors to catlearn, and particular thanks to Angus Inkster and Lenard Dome, who both contributed new code for the version 0.6.1 release. All the best Andy 2019-02-26 Wills, A.J., O'Connell, G., Edmunds, C.E.R., & Inkster, A.B.(2017). Progress in modeling through distributed collaboration: Concepts, tools, and category-learning examples. The Psychology of Learning and Motivation