IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
Icon Slate - Icon Slate lets you easily compose, import and export desktop icons in many formats.
Icon Generator - Icon Generator is a little application built on AIR that lets you generate a CS5 or Web 2.
FastIcns - DigitalWaters.net Projects - by Matteo Mecucci and Juna Salviati
Symbols for Sketch - A set of templates to make an icon font with Sketch (gulp)
icoworks - .ico editor for Windows 8 and Windows RT