The Creative Commons has released CC Search Beta.
Here's an excerpt from the announcement:
Our goal is to cover the whole commons, but we wanted to develop something people could test and react to that would be useful at launch. To build our beta, we settled on a goal to represent one percent of the known Commons, or about 10 million works, and we chose a vertical slice of images only, to fully explore a purpose-built interface that represented one type but many providers. . . .
After a detailed review of potential sources, the available APIs, and the quality of their datasets, we selected the Rijksmuseum, Flickr, 500px, the New York Public Library as our initial sources. Later, after discussions with the Metropolitan Museum of Art regarding their collection of public domain works, which were released under CC0 on February 7, 2017, we incorporated their 200,000 CC0 images as well. . . .
The prototype of this tool focuses on photos as its first media and uses open APIs in order to index the available works. The search filters allow users to search by license type, title, creator, tags, collection, and type of institution.
CC Search Beta also provides social features, allowing users to create and share lists as well as add tags and favorites to the objects in the commons, and save their searches. Finally, it incorporates one-click attribution, giving users pre-formatted copy for easy attribution.