LiteIcon - LiteIcon is a simple app which allows you to change your system icons quickly and easily.
IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
Replacicon - Just updated to macOS Big Sur? You may have noticed some of the apps in your Dock look a bit inconsistent with the rest of the system.
Quick Any2Ico - Quick Any2Ico is a FREE Portable Application that creates high quality Icon files from any File...
IconViewer - Bot Productions's IconViewer utility allows you to view, copy, and save the icons in a file through its property sheet.
IconWorkshop - Application to create and manage software icons. A must for developers.