BurningWell

http://www.burningwell.org/

BurningWell is an online stock photography resource where you can find free images to download and use on the web for any purpose without restrictions. The images on BurningWell are released under the public domain and both photographers and users from all over the world can make donations of free photos graciously.

All stock photos are in high-quality and available at a resolution of 1600x1200 pixels or even larger (no maximum size limit) in the JPEG format. To download the free pictures, just right-click the photo and save it to your computer.

FreePhotos.se

http://www.freephotos.se/

FreePhotos.se is a website collecting free images released under the public domain. The photo are not taken by professional photographers, but are updated persistently and they are also syndicated via RSS feed.

All the free pictures are available only in one size and their quality varies (though it is generally high). Each free photo comes with all the info regarding the camera used, its resolution, the date the photo was taken, the photographer, the location, and more. Since all the images on the site are released under the public domain, you have no restrictions whatsoever to use them in your projects.

Ookaboo

http://ookaboo.com/o/pictures/

Ookaboo is a collection of free images, indexed by precise terms from the semantic web. Ookaboo has two goals: to improve the state of the art in image search for both humans and machines, and to construct a knowledge base about the world that people live in that can be used to help information systems better understand us.

All the free images are available only in one size and their quality depends on the photographer (though it is generally high). All pictures on Ookaboo are released under the public domain or under a Creative Commons license, meaning that you can use the free pictures for your creative projects.

RoyaltyFreeImages.net

http://www.royaltyfreeimages.net/

RoyaltyFreeImages.net is a blog which publishes royalty free stock photos that you can freely download and use with appropriate credit and link back. New photos are added every couple of days.

All free images are in high-quality and available only in one size. All free photos are suitable for both personal and commercial use either online or offline, but please note that distribution or resale is not permitted on any venue.

The Stock Solution

http://www.tssphoto.com/

The Stock Solution is an online stock photography resource where you can find tons of free images and free stock images for complementing your creative projects. New photos are added daily.

All stock photos are in high-quality and available in a large (800x900) resolution and, when available, a link to an even higher resolution is provided. On each stock photo you can clearly see what license is associated with the image and whether the free image is suitable for commercial use.