IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
Saint Paint Studio - Saint Paint - The Essential Image Editor
IconLover - Icon editor for Windows.
Stet.io - Stet.io is a high-quality pixel management platform that allows editing the pictures with online commands or multiple options with real-time effects or filters.
IconWorkshop - Application to create and manage software icons. A must for developers.
ImageForge - - ImageForge Standard Freeware Edition: