splits contains tools for delimiting species and automated taxonomy at many levels of biological organization (eg. DNA barcoding, morphometrics), top-down (merging phylogenetic and phylogeographic methods) and bottom-up (single samples into >1 groups). Newer versions of the package via the Project Home Page link below.
Notice:
Functions related to the GMYC were updated following the publications of paper about the revised method.
Delimiting Species Using Single-locus Data and the Generalized Mixed Yule Coalescent (GMYC) Approach: A Revised Method and Evaluation on Simulated Datasets
The custom code for the multiple threhold optimization and simulated gene trees used in the paper are available at Dryad, doi:10.5061/dryad.0hv88.
The project summary page you can find here.