A nonprofit resource that provides over 1.6 million digital images in the arts, architecture, humanities, and sciences with an accessible suite of software tools for teaching and research.
Many Flickr users have chosen to offer their work under a Creative Commons license, and you can browse or search through content under each type of license.
A wide array of images from across the disciplines, but quality can be uneven and may not include attribution of original source. If you plan to post images found via Google on the Web or use them in a publication, ensure you have permissions from the original source.