Download of EEGLAB 2021.1.0.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within Design & Photo Tools, more precisely Viewers & Editors.
This free Mac application is a product of Swartz Center for Computational Neuroscience. 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:
EEGLAB is an interactive Matlab toolbox for processing continuous and event-related EEG, MEG and other electrophysiological data incorporating independent component analysis (ICA), time/frequency analysis, artifact rejection, event-related statistics, and several useful modes of visualization of the averaged and single-trial data.
You may want to check out more Mac applications, such as Cuadro or Resize Now, which might be related to EEGLAB.