CCSearch is the newly-out-of-beta search engine for around 300 million images marked as being freely licensed for Creative Commons use, across the internet. Its potential is good, but brings up a lot of modern and amateur images from Flickr and the like, even though many of the source sites are museums, galleries and archives, and other providers listed on this website already.
The official line is:
‘CC Search is a tool that allows openly licensed and public domain works to be discovered and used by everyone. Creative Commons, the nonprofit behind CC Search, is the maker of the CC licenses, used over 1.4 billion times to help creators share knowledge and creativity online.
CC Search searches across more than 300 million images from open APIs and the Common Crawl dataset. It goes beyond simple search to aggregate results across multiple public repositories into a single catalog, and facilitates reuse through features like machine-generated tags and one-click attribution.
Currently CC Search only searches images, but we plan to add additional media types such as open texts and audio, with the ultimate goal of providing access to all 1.4 billion CC licensed and public domain works on the web. Learn more about CC’s 2019 vision, strategy and roadmap for CC Search here and see what we’re currently working on here. All of our code is open source (CC Search, CC Catalog API, CC Catalog) and we welcome community contribution.