AD Brutus Symmetry is a Photoshop Creative Cloud Panel for free download. It basically uses Photoshop auxiliary lines (vertical and horizontal) as axis symmetry, but not limited to auxiliary lines, it can also be used with selections, for quick use, we can assign shortcut keys to main functions. Whether you are on a Mac or PC, you only need a computer running Adobe Photoshop Creative Cloud (from CC to CC2017+).
How to install?
Copy the ad.brutussymmetry folder to the following location
Win: C:\Program Files (x86)\Common Files\Adobe\CEP\extensions\
Mac: ~/Library/Application Support/Adobe/CEP/Extensions