The version 1.0.1 of SSM package is released today (http://doi.org/10.5281/zenodo.995740).

SSM (standard substitution models) is a BEAST 2 package containing the following standard time-reversible substitution models: JC, F81, K80, HKY, TrNf, TrN, TPM1, TPM1f, TPM2, TPM2f, TPM3, TPM3f, TIM1, TIM1f, TIM2, TIM2f, TIM3 , TIM3f, TVMf, TVM, SYM, GTR. More details are available at https://github.com/BEAST2-Dev/substmodels

Regards,
Walter