PyGreSQL 5.0 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 a product of PyGreSQL team. We recommend checking the downloaded files with any free antivirus. The software lies within Developer Tools, more precisely IDE.
From the developer:
PyGreSQL is an open-source Python module that interfaces to a PostgreSQL database. It embeds the PostgreSQL query library to allow easy use of the powerful PostgreSQL features from a Python script. PostgreSQL is a highly scalable, SQL compliant, open source object-relational database management system. With more than 20 years of development history, it is quickly becoming the de facto database for enterprise level open source solutions.
You may want to check out more software for Mac, such as JBuddy Bot Builder, Pleinpot or PLCEdit, which might be similar to PyGreSQL.