Past4 4.11 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.
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. Past4 for Mac lies within Education Tools, more precisely Science. The actual developer of this free software for Mac is Øyvind Hammer.
From the developer:
Past 4 is free software application for scientific data analysis, with functions for data manipulation, plotting, ecological analysis, univariate and multivariate statistics, spatial analysis and time series, stratigraphy and morphometrics. The version 4 is released with 64-bit support.
You may want to check out more Mac applications, such as AstroPlanner, Calcline or AstroGrav, which might be similar to Past4.