Weibo

Allows developers access to Goodreads data in order to help websites or applications that deal with books.

Access to VKontakte's API. This has a variety of features such as authorization via VK, embedding VK comments ...

The largest social networking website for artists and art enthusiasts.

Imgur's API exposes the entire Imgur infrastructure via a standardized programmatic interface.

Enables an app to interact with most of Twitter’s functions.