Download of Gifski 2.23.1 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac application was originally designed by Sindre Sorhus. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The application lies within Design & Photo Tools, more precisely Viewers & Editors.
From the developer:
Gifski is a macOS app for the gifski encoder, which converts videos to GIF animations using pngquant's fancy features for efficient cross-frame palettes and temporal dithering. It produces animated GIFs that use thousands of colors per frame.
You may want to check out more software for Mac, such as Morph Age, Photo Mechanic or MozoDojo, which might be related to Gifski.