One Automattic "hack day" many years ago, I released Genericons, a font containing a bunch of little icons useful for blogs and websites. For this years hack day, I created a new version, Genericons Neue. It's visually more coherent and icons are better weighted against each other. The set comes with minified SVG files ready for use, as well as an icon font if you want to use that (buyer beware). If you're a fan of Node, there's a module you can install. It's super easy to use, and I encourage you to use the set, fork it, customize it, and bundle it with your themes.
The original Genericons set was created for the WordPress Twenty Thirteen theme. A goal for that theme was to be colorful, and in order for that to work, icons for tags, categories and comments had to be easily re-colored using only CSS, something which PNGs did not allow. SVG support wasn't impressive at the time, and so Genericons became an icon font. Inspired by The Making of Octicons, Genericons were pixel-perfectly drawn in Glyphs Mini. It was quite an arduous process.
Genericons Neue is focused fully on icons, so all logos have been removed — more on that in a bit. The set now use
grunt to build everything from the minified SVGs to the icon font. The build process is like a black box: you feed it a folder of SVG icons you drew, and it outputs formats ready to be used in your themes and web projects.
If you're coming from Genericons, do note that there are no logos in Genericons Neue. Because Genericons was so early to the icon-font game, it more or less became a kitchen-sink for icons and logos. First just a few logos — "the most important ones" — then slowly it grew into too many. There were a bunch of little dingbats and one-offs, like triangles for CSS speech-bubbles today better done using just CSS alone. It was useful at the time, but it diluted the focus on being a great and consistent set of icons. On top of that, logos present unique challenges. Aside from having to be kept up-to-date with rebrandings, how should they be sized? Every logo is drawn on a unique grid, they don't all fit well on a tiny pixel-perfect grid.
If you would like to upgrade from Genericons to Genericons Neue, you can use logos from a different set, such as Social Logos. If you are only using the icons also present in Neue, it's a drop-in replacement as the icon font will map to the same codepoints.
I hope that you'll like Genericons Neue!