Mathematica packages PERMS. My Mathematica package PERMS 2.1 is a collection of tools for investigations of permutation groups and for doing calculations in the representation theory of symmetric groups. It comprises: Tools for the investigation of permutation groups; Group ring tools; Partitions, types, tableaux; Special idempotents and generating elements; Characters, Littlewood-Richardson rule, plethysms; Discrete Fourier transform; Tools, concerning tensor investigations.