The gif collection began as the web display section for The Iconolog Windows collection of 22,963 .ico. The purpose of the collection is to provide a basic resource of 32x32 icons in a form that is accessible on all platforms. The major criteria for addition to the collection are that the icon portrays something not already present or that it is the work of an iconographer not yet represented. The current gif collection contains 7403 icons. The original icons were collected wherever I found them, few icons were credited.
Indexes are alphabetic by category then subject.
By the way, these pages contain lots of images. Category Index Display using an example icon from each subject category of The Iconolog. Each icon links to the display page for that category creating a graphic index to online display. Frames only, others use one the indexes above to view gifs online.