Obsessive cheat sheet to favicon sizes/types. Please contribute! (Note: this may be in flux as I learn new things about favicon best practices.)
Let webpack generate all your favicons and icons for you
A small library for manipulating the favicon, in particular adding alert bubbles and changing images.
Make use of your favicon with badges, images or videos
IP lookup by favicon using Shodan
Square loading favicon.
Generate favicon for all major platforms
Swift library to detect icons supported by a website.
Gem to display the rails environment on the favicon
Discover and monitor internet assets using favicon hashes across search engines.
Create dynamic favicons based on your environment settings.