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.
LiteIcon - LiteIcon is a simple app which allows you to change your system icons quickly and easily.
CandyBar - Brought to you by Panic and the Iconfactory, CandyBar 3 brings the best of CandyBar 2 and Pixadex 2...
IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
Pictogram - Customize macOS app icons with ease
IconWorkshop - Application to create and manage software icons. A must for developers.