AT-UI - UI library for developing powerful web interfaces
Icon Slate - Icon Slate lets you easily compose, import and export desktop icons in many formats.
Sketch Repo - Collection of resources for anyone who uses Sketch
Icon Generator - Icon Generator is a little application built on AIR that lets you generate a CS5 or Web 2.
Git Sketch Plugin - Version control for designers
IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.