Openverse

openverse.org

オープンライセンスの画像・音声ファイルを数億件から検索できる検索エンジン。ライセンス情報も明記されており、プロジェクトで適切にクレジット表記できる。

Openverse searches hundreds of millions of openly licensed images and audio files and surfaces the specific license each one carries, which matters when a notebook's output will be reused or published somewhere that needs proper attribution. It's a search layer over other repositories' content rather than a host, so double-check the license on the original source page before relying on Openverse's listed terms. It's built for finding reusable media, not for scholarly citation the way a bibliography source would be.