Switch is a minimalist vector icons set presented with clean lines and sharp edges. Part one in the set consists of 54 painstakingly handcrafted icons, free and presented in both light and dark format. You’re free to use these for both personal and commercial use with no credit necessary. Recommended: Open source vector icons Website: http://www.fullcreative.com/…/switch-a-set-of-54-minimalist-vector-icons/ License: [...]

A fantastic set of Free Social Bookmarks Icons, available in 32-bit transparent PNG file format and in 8 different standard sizes, ranging from 16×16 to 512×512 pixels. The package also contains the Vector PDF files of all icons that are compatible with Adobe Illustrator and can be rescaled to any size without a single loss [...]

gcons Vector, the vector version of the popular open source icons – gcons. The vector icons are fully scalable and can be resized to any dimension. These open source vector icons can be used freely in personal and commercial projects. Download: http://www.greepit.com/open-source-icons-gcons/ License: Free

The gcons fever is raising and here comes-in another PNG icon set, Vibricons. The name of this icons set is inspired by the open source icons – gcons. Vibricons contains popular types of icons and symbols with vibrant and bold colours. The volume 1 comes with 15 png icons in 128, 64 and 32 px sizes. Website: http://www.thewebdesignblog.co…/free-vibrant-png-icons/ License: [...]

WooCons, name inspired by gcons, is a set of 170 Free Web Icons by WooThemes. This crispy and tasty icons set is available as 32×32 PNG’s. A colorful collection of widely used icons, perfect for web applications and web sites. Website: http://www.woothemes.com/2010/08/woocons1/ License: GPL

Greepit previously released a set of 100 open source icons for UI designers and web developers. These 100 cool icons were released by Smashing Magazine and we received an awesome feedback. Thanks to everyone! Our friends at WebDesignerDepot released a set of 208 cool free icons – Reflection icons. These cool Reflection icons are released [...]

A set of Free, helpful, quality User Interface Design elements, icons and styls to design faster wireframes and create better mockup deliverables in Illustrator. The set contains: GUI library – Hundreds vector elements for interface design Minimal UI icons set – 260 vector icons for Illustrator Styles library – 200 styles to apply in Illustrator [...]

Awesome collection of Free Weather Icons. The weather icons in the package are very nicely designed with a eye catching color combination of blue, orange and grey. The set contains 38 PNG weather icons in 128*128px. Website: http://xiao4.deviantart.com/art/tick-weather-icons… License: Free

For UI designers and website developers, there are a huge number of nice icon collections but most of these collections are designed for specific purpose, theme or industry. Most of the time, designers have to mix and match desired icons and customize them according to the requirements resulting in a lot of effort, un-balanced designs, [...]

A useful and rare free collection of 60+ SVG and PNG Network Icons by Open source architecture (OSA). These Network Icons are based on the Tango Free Desktop Project SVG images. Website: http://www.opensecurityarchitecture.org/cms/library/icon-library License: Creative Commons