Download of ProtAnt 1.2.1 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application lies within Productivity Tools, more precisely Office Tools. This free Mac app was originally produced by Laurence Anthony. We recommend checking the downloaded files with any free antivirus.
From the developer:
ProtAnt is a freeware prototypical text analysis tool (developed in collaboration with Paul Baker of Lancaster University). ProtAnt takes a corpus of texts (UTF - 8 encoded) and compares them either individually or as a whole against a reference corpus (UTF - 8 encoded) or list of 'key' words (UTF - 8 encoded) to find characteristic features in the target files.
You may want to check out more software for Mac, such as PitStop Extreme or FileOpenInstaller, which might be similar to ProtAnt.