Icon Editor by RedKetchup - View and edit Windows icons (ICO files) directly from the browser. Create icons in 8-bit, 24-bit, or 32-bit color depth. Extract all the layers of an ICO file as PNG images.
Anima App - Design, get feedback, convert to code, publish, iterate.
IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
Sketch Repo - Collection of resources for anyone who uses Sketch
IconWorkshop - Application to create and manage software icons. A must for developers.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.