WordPress.org API's is a set of API's on WordPress.org web site.
Secret key generator for wp-config.php.
Stats about the systems websites are running WordPress on.
WordPress Version Checker.
Details about the various individuals who contribute to the WordPress code base. Used in Credits Screen.
Note: Some docs on this api can be found here: http://dd32.id.au/projects/wordpressorg-plugin-information-api-docs/
Example: Basic Example of getting total download count of a plugin - http://wp.tutsplus.com/tutorials/plugins/communicating-with-the-wordpress-org-plugin-api/
List of popular import plugins in the WordPress Plugin Directory used by Tools → Import Screen.
Returns a JSON encoded array of file MD5 checksums for a given WordPress release / locale. Although english is the default, it's suggested to pass it for 100% compatibility with core.
Used by the theme and plugin editor to get a reference to documentation generated with phpDocumentor.