A utility which captures a terminal session and saves it as an animated SVG.
A website that lets you upload SVG files and it'll convert them into Bootstrap compatible glyphicons for use in your website. Also has a huge archive of icons that you can download and use.
Google has open sourced their Material Design Icons Library. It includes icons in PNG, SVG, and CSS glyph formats for many devices, functions, and features. Spritesheets are included. The icons have a Creative Commons By Attribution-Share Alike v4.0 license, so feel free to download and use them.