CC Search is a tool that help find openly licensed and public domain works.
Currently CC Search only searches images, but in future it may include additional media types such as open texts and audio.
CC Search searches across more than 300 million images. It aggregates results across multiple public repositories into a single catalog, and facilitates reuse through features like machine-generated tags and one-click attribution.
Please note that CC does not verify whether the images are properly CC licensed, it is advisable to verify the licensing status and attribution information before reusing the content.