Stock Free Images
Stock Free Images is a free online library where you can find all images completely free under an unlimited license of use for any kind of web projects. Stock Free Images also offers photos from different services which you can buy on the original source. You need to have an account to download the pictures on Stock Free Images and add a link back to the image author.
All files are available in HD and JPG format. Once you find the image you are looking for, just hit the "Free download" button and save it to your computer.
Kozzi is a web-based agency that distributes and sells exclusive quality images from professional photographers. It proclaims itself to be the first online photo library to support advertising. Using Kozzi, you can download up to 30 images a month for free. You need to create a free account to use the service.
All pictures are available as high-quality JPGs and they vary in size. Prices range from $0.99/month to $9.95/12 months (to download 25 images/day), $2.49/month to $24.95/12 months (for 75 images/day) and $7.49/month to $74.95/12 months (for 250 images/day).
Getty Images RF
Getty Images RF is the royalty-free version of the popular digital library Getty Images, where you can find a wide variety of pictures, vectors and illustrations, both for personal and commercial use. You need to register to use this resource.
All images on Getty Images RF are available in the JPEG format, and their resolution ranges from 72dpi to 300dpi, according to their size. Prices for each picture vary from $5 to $525.
F11Digital is a web-based image collection dedicated to digital photography, where you can browse and download royalty-free images to use for complementing your creative projects. Registration is mandatory to download, to vote and to comment the photos.
All images are in high-resolution, in the JPEG format, and they are available in different sizes. You can download the pictures to your computer by clicking the download button below every image (a ZIP download option is also available), or by sending them as an e-card (a digital postcard). F11Digital also allows you to save the images you like most while browsing the collection, with a digital lightbox (a non-intrusive digital notebook who follows you around the site and keeps track of all the photos you ask it to "remember").
FreeFlowerImages.com is a website that collects images of flowers that you can use for your commercial and personal projects. You can browse through the photos by using either the search field or the list of categories. You can also find the pictures you need by looking at the colors of the flowers.
All the images are available in high-resolution, JPEG format and a size of 640×479 pixels. You can download them with a simple right-click action. The images contain no watermarks and you can request the website owner a larger version of your favorite photo in case you need a higher resolution.
Hoover Stock Photography
Hoover Stock Photography is an online image library where you can purchase / download beautiful pictures for your web projects. Two kinds of pricing levels are available: Free (requires that you link back to the service) and Pro ($1 to $2 for each image and no link back required). You don’t need to register to download the images but you must create an account if you want to make a purchase.
All pictures are available in high-quality, JPEG and EPS formats, and they vary in size according to the resolution they were shot.
Studio7Designs is a free, nature-oriented photography website which publishes free images under a Creative Commons 3.0 license, that you can use for all purposes. Studio7Designs only asks you to link back to the service as a sign of acknowledgement of their work.
All images available on the site are offered in high-quality, in the JPG format, in different sizes. You can download them just with a simple right-click.
Springer Images is an online image library where you can find over 2.8 million royalty-free stock photos focusing on scientific, technical and medical fields that you can use for noncommercial web purposes. You need to register before downloading any image from Springer Images.
All photos are high-quality and available in the JPG format and different sizes. You can also customize specific sets of images and export them to use on your web projects. If you subscribe to the service, you can also browse Springer Images catalog from your iPhone, iPod Touch or iPad.
Wellcome Collection is an online stock photography library where you can find stock images devoted to medical and social history, contemporary healthcare and biomedical science, all released under a Creative Commons license. Registration is not mandatory to download the images, but by signing in you can take advantage of the lightbox feature which allows you to temporarily save online the photos you like while you keep on browsing the archive.
All stock photos are available in high-quality, JPG format and they vary in size. To download them, just right-click the photo you need and then choose "Save As...". Print versions are also available upon request.
Digital Images for Education
Digital Images for Education is an online project from JISC Collections where you can find a lot of images that focus on the education field. There are over 56,000 royalty free images coming from ten different sources and their usage is limited to academic purposes only.
All images are available in high-resolution, in TIFF and JPEG formats, and they vary in size. You can download each image with a simple right-click procedure and save it to your computer.