Web of software interface designers are in constant need of free png icons they can use in their project. I have found some great websites offering free icons for download and I am publishing list of best ones for my personal reference, hoping other people will find it helpful.
1. Icon Archive
Huge archive of icons for Windows and Mac, also available in png format. All icons are contributed by various icon designers all over the world. everything organized and sorted in categories.
Another extensive collection of user contributed icons. Only some icons are available in png format, but maybe you want to check gif icons page
3. Feed icons
Rss feed icons to use in various projects. Very helpful for WordPress skins. Various colors available.
Software related icons.
Few hardware icons.
Some great characters-two sets available, both in png format.
These are only few picks from tones of icons available online.
For more extensive resources you might want to check these lists of free icons:
Looks like you are going to download lots of stuff. Enjoy.
Description😕 Pack includes Ipod Nano, Ipod Shuffle, Ipod Video, MacBook series in .ico, .icns and png(256x256px) format. PSD files are also included, but zipped and password protected. To get zip password you must email creator and explain why you need original files. Icons are free for personal use.
Download: zip(11,2 mb)