You could have downloaded APLpy 1.1.1 for Mac from our application library for free. The application lies within Education Tools, more precisely Science. This free Mac application is a product of APLpy Team.
From the developer:
APLpy (the Astronomical Plotting Library in Python) is a Python module aimed at producing publication-quality plots of astronomical imaging data in FITS format. The module uses Matplotlib, a powerful and interactive plotting package. It is capable of creating output files in several graphical formats, including EPS, PDF, PS, PNG, and SVG.
You may want to check out more Mac applications, such as sciatrope, Analytics to Earth or TreeView X, which might be similar to APLpy.