IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Icon Slate - Icon Slate lets you easily compose, import and export desktop icons in many formats.
Invision - Prototyping and collaboration for design teams
Icono Maker - Icono Maker is an icon maker for Windows.
Sketch - Professional digital design for Mac.