Open Source ChromeOS Icon Sets

Python script (and library) for easy and simple export of icons from web icon fonts (e.g. Font Awesome, Octicons) as PNG images. The best part is the provided shell script, but you can also use it’s functionality directly in your (probably awesome) Python project. There’s also font-awesome-to-png script for backward compatibility with the first iteration of the concept. You can use IconFont (and IconFontDownloader for that matter) directly inside your Python project. There's no proper documentation as of now, but the code is commented and should be pretty straightforward to use.

A Glass GUI for XMMS based on the Crystal Icon set

The Lila theme is a community project to provide an icon set and other lila-style resources for your desktop. The theme to based around SVG graphics - which means they can be scaled to any size without loss of quality.

MingCute is a set of simple and exquisite open-source icon library. Whether you're a designer or a developer, it's perfect for use in web and mobile. Every icon is designed within a 24 x 24 grid, giving an outline and filled styles, 2px stroke. Support for SVG,PNG and webfont. Head on to the website of MingCute. Click the icons, you can adjust the color size, and then download the icons in SVG or PNG format.