Favicon Checker - Easily compare your favicons on all major web browsers.
Favicon.io - The only favicon generator you need for your next project. Quickly and easily generate your favicon.ico file from text, image, or choose from hundreds of emojis. No design or technical skills required.
Faviconographer - Favicons for your Safari Tabs
favico.js - Use badges, images or videos with your website's favicon
Tinycon - A small library for manipulating the favicon
Epic Favicon Generator - Generate 20 Favicon Sizes, 21 Icons, w/ 21 Tags!