It was the only icon search engine when it was first established. There are thousands of free icons organized by their subjects.

Actual news stories fuel Photoshop contests and galleries of wacky doctored pictures with an emphasis on political and strange news.

Large collection of vector and raster clip art in variety of styles. Free for personal and commercial use to licensed owners of Microsoft products.

HDRI - high dynamic range image - photography site with an extensive library of images for use in 3D graphics rendering. Bespoke photo shoots offered. Free monthly download available.