Matriosity is a free Mac application designed to help with serial matrix creation – in case you want to get your Schoenberg on, atonal style.
It lets you enter in a prime row, either as numbers (1-11, and either 0 or 12 for C) or letters (C, C#, etc.). It then generates a serial matrix, displaying the data as per the users’ preference as numbers or letters, and displaying the prime form of the matrix’s dyads, trichords, tetrachords, and hexachords. Matrices created by Matriosity can be saved for later and printed. Version 1.2 supports matrices of different sizes and repeated pitches.
Matriosity also provides audio previews (though it takes a bit of serial geekery).