Sketch Repo - Collection of resources for anyone who uses Sketch
IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
Build with Sketch - Free LEGO-like kit for Sketch
IconsExtract - Extract icons and cursors stored in EXE, DLL, OCX, CPL files
Icon Slate - Icon Slate lets you easily compose, import and export desktop icons in many formats.
IconViewer - Bot Productions's IconViewer utility allows you to view, copy, and save the icons in a file through its property sheet.