Image Source Control
Image Source Control started in 2012, after I got a letter from a lawyer about a missed author information for a photo I got from an image database. The plugin makes sure that image credits are stored and displayed reliably. One can choose between various display options like an overlay above the image, a credit line below it, a list of credits after the post content, or a dedicated global image sources list.
Image Source Control also helps identify and remove unused images to clean up your site to save time and money.