Font Awesome - Font Awesome makes it easy to add vector icons and social logos to your website. And version 5 is redesigned and built from the ground up!
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Themify Icons - A complete set of icons for use in web design and apps, consisting of 320+ pixel-perfect, hand-crafted icons that draw inspiration from Apple iOS 7.
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
Dashicons - Dashicons is the official icon font of the WordPress admin as of 3.8. The Dashicons project is no longer accepting icon requests. Here's…
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.