SpringerImages
Developed by the publisher Springer, SpringerImages is a collection of over 1,600,000 scientific, technological, and medical images. The images include photos, tables and figures, charts, graphs, histograms, and illustrations. All science disciplines are covered, however, more than 61% of the images are medical or life sciences-related. Although, SpringerImages is subscription-based, over 29,000 images are freely available.