Practika is a set of 11 icons at 256×256px, 128x128px, and 64x64px in png format. These icons can be used for a variety of purposes — in particular, in portfolios and in corporate designs.
You can use the set for all of your projects for free and without any restrictions. However, it’s forbidden to sell them.
Function is a set of 128 icons at 48×48px in png format. The author tried to keep a consistent style with quite a glossy look to the icons. Some of the main social media icons have been included, such as: Design Float, Digg, Delicious, Furl, Technorati, Flickr, Stumble Upon, Twitter & Many more…
The author states these icons are free, and may be used anywhere. They do request you share the icons by linking to their blog post with the download. The set may not be redistributed.
WebInjection is set 26 icons at 48×48px in png format. The included Photoshop file is not a source file for the icons. The set was designed by Midtone Design Studio. The icons were tediously hand crafted by designer Jonatan Castro Fernández.
This free icon set is for use in your personal and commercial projects, and can be used without attribution. It may not be redistributed.