Boolean is a set of 100+ free icons that can be used easily in web applications.
It has a motto: "The Pixel Icon City" as the set is wrapped like a city with various stores and new ones are added regularly.
It includes items like actions, e-mails, signs, electronics and all the icons are in transparent PNG format with 16*16px size.
spirit20 is a set of 450 free icons that are ideal to be used in web applications.
It includes various items of actions, media, documents, mail, system and more.
The set is in transparent PNG format and sized 20*20px.
And, it is completely free to be used in personal and commercial projects (and no attribution is required).
Touch screen devices, specially with the popularity of iPhone and iPad, are on the rise.
Just like standard websites, icons help so much in guiding users "about the the usage" of the websites/applications built for them.
GestureWorks is sharing a set of 20 free gesture icons that covers most of the scenarios like:
The icons come as transparent .PNG files and also in vector formats (.EPS, .AI, .PDF) for improving further.
Project Icons is a set of 165 free icons and 3 icons badges that are designed in detail.
The set includes items from multimedia to hardware, social networking and much more.
They come in 32*32px sizes (some of them are in 48*48px too) and in .PNG, .ICO, .ICNS formats.
There are lots of social bookmarking icon sets and new ones with a twist are being designed everyday.
Socialmonochromicons is a set of 150 vector social bookmarking icons to help you create a custom one by providing you the shapes of popular services.
They come in vector (.EPS) and transparent .PNG files so you can customize them easily.
This is a set of 3D social bookmarking icons that are placed over a platform like statuettes.
They come in a pretty big size (435*424px) which can be scaled to a custom size preferred and the format is transparent PNG.
Icons in the set are: Twitter, Facebook, MySpace, WordPress, Picasa, RSS, Yahoo and Yelp.
They are free to be used in personal and commercial projects (no backlinks are required).
The only limitation is that they can not be re-distributed. Please mention this URL if you share them on your website, and thanks very much for that.
Gentleface Toolbar Icon Set is a set of 244 icons that focuses on the "toolbar part" of applications..
However, they are pretty enough to be used in any type of software, websites or mobile applications.
The icons include pagination arrows, ratings and voting controls, social interaction symbols, file system and text editor actions.
They come in 16*16px, 32*32px, 48*48px sizes in .PNG and .SWF formats (with black on white and white on black colors).
P.S. They are free to be used in personal projects.
Default Icon is a set of frequently improved and free vector icons in their simplest form possible.
Besides websites, they can be used in any portable devices as well considering the resolution is only 1bit.
The items are 16px*16px by default (any size can be created with the vector files) and comes in .EPS, .PNG and .GIF formats.
Psdtuts+ is sharing a beautiful and free icon set, named Isloo, which are designed in detail and have a shiny, web 2.0 look.
The set consists of 50 icons that comes in 128px*128px sizes and as transparent .PNG files.
They are designed to celebrate the 3rd anniversary of the popular icon search engine IconFinder and free to be used in both personal and commercial projects.
iconSweets is a set of 60 free vector icons which are perfectly suitable for iPhone and iPad applications or a web project.
The set comes as .PSD files and in 16×16px + 32×32px sizes.
Items inside are the frequently used ones like edit, save, comment, e-mail and more.
It can be used in both commercial and non-commercial projects.
