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.

IconsExtract - Extract icons and cursors stored in EXE, DLL, OCX, CPL files

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.

WinIcon Customizer - WinIcon Customizer is the standard way to change all the icons on your Windows PC.

IconViewer - Bot Productions's IconViewer utility allows you to view, copy, and save the icons in a file through its property sheet.