What Font Is - Find any font from any image (commercial or free)
Octicons - Your project. GitHub's icons.
Font Viewer - Font Viewer is an application which does exactly that - it views fonts!
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.
AMP Font Viewer - Jump to Download - Download.
WebHostingHub Glyphs - High quality icons that are easy to use with Bootstrap, other CSS frameworks and in any web projects.