ProtTest 3.4 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X is an intellectual property of Phylogenomics Lab.
The most popular version among ProtTest for Mac users is 3.4. The program lies within Education Tools, more precisely Science. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
ProtTest is a bioinformatic tool for the selection of best-fit models of aminoacid replacement for the data at hand. ProtTest makes this selection by finding the model in the candidate list with the smallest Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC) score or Decision Theory Criterion (DT).
You may want to check out more software for Mac, such as Integrated Data Viewer Installer, UN-SCAN-IT Demo or ScienceMatrix, which might be related to ProtTest.