Available here: http://www.pinvoke.com/
Licensed under Creative Commons Attribution 3.0 license and require a link to be placed back to the site.
A license can also be purchased for each icon set.
Diagona Icons - 400 icons like this …
Fugue Icons - 2,225 icons like this …

Some great Open Source Icons from 37Signals (the people behind Backpack, Basecamp, and other great Web Applications) …
http://37signals.com/svn/posts/1844-open-source-icons
Came across these free rss icons:
http://0at.org/blog/free_rss_icons
15 interesting takes on the traditional RSS icon!
There are sometimes issues with using free web icons …
- restrictive license (several free icon sets require a credit or simply cannot be used on commercial sites)
- you want something more unique - because they are free you often see the free icon packs used - you might want something less commonly used
If free icons are not suitable because of the reasons above or if you can’t find what you are looking for among the free web icon resources here check out these cheap web icons from iStockphoto. I am a big fan of iStockphoto - not least because you get a good quality free stock image every week (there is no cost to join to get access to these). They have great search features and a huge selection of photos, icons and vector images.
A great roundup of links to free and open source icons with information on authors and licenses AND screenshots. A must see list if you are looking for free icons!
read more | digg story
Adding RSS to an application or changing your blog design? Here’s a site with RSS feed icon …
read more | digg story
A set of icons for web applications for “free”. Where free isn’t completely free …
- applications need to be written in ASP.NET
- the licence requires a link (they suggest from the about page of the app)
- you are unable to redestribute software with the icons
- the licence can be revoked at any time

read more | digg story
Over 300 Icons licensed under creative commons. Examples …

read more | digg story
While developing our list of icon resources we came across some great articles on Digg related to icon design. Here are a number of mistakes to avoid when designing icons. A great discussion with plenty of examples.
read more | digg story
Interesting article on the development of the biohazard symbol.
read more | digg story
Two presentations on icon design. We found them interesting … thought you might too …
Continue reading ‘On icon design …’
We build websites every day. Over time we have put together a list of resources to find free web icons. We thought this would be of benefit to other developers and webmasters. Be sure to leave a comment if you have other resources.