Dripicons is a good-looking free icon set of 90+ items which are designed in flat style.
It includes icons that are suitable for web apps, like: arrows, media, charts and more.
The set is available in many vector formats (PSD, AI, EPS, PDF, SVG) and also as a webfont.
Map Icons is a free icon font that is built to be used with Google Maps API + Google Places API.
These icons extends the Google Maps Marker object to enable either an image or SVG marker to be used with the icon placed on top as a label. But, but they can be a perfect fit for any mapping-related content/app.
It includes 100+ icons with items for almost any type “points of interest” and location markers.
It seems like there are still areas in icon design where you can hardly find free sets about them.
Lots of icon sets are published at WRD and this is a unique one: SEO Icons.
The set has 25 icons with items like analytics, code optimization, lading page, performance, page speed and much more.
They are available in 3 different styles and in multiple file formats (AI, EPS, SVG).
Noupe has recently released a pretty huge icon set of vector monuments from all around the world.
The set includes 250 items with well-known monuments of many countries and can fit well to any country-focused design project.
All items are available as PNG (32*32px, 64*64px and 128*128px), AI, EPS, PSD and SVG.
And, they are free to use for both personal or commercial projects.
There are various web-based tools for creating and customizing icon fonts.
Fontastic is another solid option for that which enables us to choose items from multiple icon sets.
The chosen items are combined into a single font with a click where this approach helps minimizing the font size as we only choose the icons needed.
It is also possible to intervene the naming process and import our own SVG icons.