FolderMarker 3.3.1 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The actual developer of this software for Mac is Pavel Veretennikov & Elena Drozhzhina. The program lies within Design & Photo Tools, more precisely Viewers & Editors.
From the developer:
To mark folders any look is now easier than ever!
Drag and Drop folders into the app to mark them.
Customize icon like you want with Text, Images, Icons, Emoji and Generic symbols.
Add your own images by dragging and try several compositing modes.
Change color any convenient way by color wheel, hue slider and color shuffle.
When the icon doesn't need any longer - use restore preset.
You may want to check out more Mac applications, such as FolderMarker Free or FolderMarker Emoji, which might be similar to FolderMarker.