List of Drupal contrib modules with API documentation available in this site
Drupal Contrib Module API Documentation
This site has API documentation for the list of contributed modules listed below. The documentation for these modules have been parsed from the source code for these modules similar to how api.drupal.org has done it for Drupal Core. If you think any of this documentation can be improved do submit your patch to improve the documentation at the module's issue queue on Drupal.org.