Icons collections are a set of preset or custom icons under a common topic. A collection might be grouped into subsections. This addon distributes the following collections:
FontAwesome - Licensed under GPL
The most popular and complete icon collection, offering a Free and Pro versions.
Ionicons - Licensed under MIT
Beautifully crafted open source icons built by the Ionic Framework team.
Teenyicons - Licensed under Creative Commons
Designed on a 15x15 grid, Teenyicons easily fit in very small spaces and maintain a crisp look.
Zondicons - Licensed under Creative Commons
A collection of icons with charming yet sophisticated personality designed by Steve Schoger.
The preset collections are a good start, but you can always extend them with your own collections, eg. your FontAwesome Pro collection.