VisualPharm is sharing various sets of beautiful free icons that are offered in Windows, Mac & PNG formats.
Icon sets are themed differently from animals to office space or finance icons. And, a set named “Must Have Icons” which includes 59 icons is a nice fit to be used in web applications.
All sets come in 7 popular sizes: 16*16px, 24*24px, 32*32px, 48*48px, 64*64px, 128*128px & 256*256px.
They are free to use in personal & commercial projects (a link back is required).