Wikipedia
Freesound
Freesound is a collaborative repository of Creative Commons licensed audio samples with more than 230,000 sounds and 4 million registered users (as of February 2015). Sounds are uploaded to the website by its users, and cover a wide range of subjects, from field recordings to synthesized sound effects. Audio content in the repository can be tagged and browsed by folksonomic means as well as standard text-based search. Audio content in the repository is also analysed using the open-source audio analysis tool Essentia, which powers the similarity search functionality of the site. Freesound has a RESTful API through which third-party applications can access and retrieve audio content and its metadata.