Axialis IconWorkshop
Axialis IconWorkshop is software that can be used to edit and create icons for Windows (.ICO), macOS (.ICNS), and UNIX (.PNG) systems. However, the software itself can only be installed on the Windows OS.
A library of elements in IconWorkshop can be used to produce a wide variety of icon styles. The tools enable the direct import of graphics from Photoshop and Illustrator and support plugins.