The websites in the list contain images that are in public domain or offered for free under attribution license.

PDPhoto
Stock.XCHNG
FreeStockPhotos.com
morgueFile
Pixel Perfect Digital
Open Photo
Image After
Stock Vault
Free Photographs
FreeImages.co.uk
bigfoto.com
Geek Philosopher
Aarin Free Photo
Photo Rogue
FreePhotos.com
Free-StockPhotos
FreeMediaGOO.com
AMG Media
Creating Online
Yoto Photo
Woophy
Cepolina Photos
From Old Books
Majestic Imagery
BurningWell.org
FreeDigitalPhotos.net
Free Photos Bank
Piotr.Pix
Unprofound.com
Stockcash
Diwiesign Studio
Photo Repository
Design Packs
Free Large Photos
Mayang\'s Free Textures
Microshots
Karen\'s Whimsy
Free Stock Magic
Free Range
Free Photo 1