Can any one please let me know what modules are available to implement a REST API?
So far I've only found the Redmine REST API module, which is used for Redmine.
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For a REST API implementation on Drupal, use the Services module.
A standardized solution of integrating external applications with Drupal. Service callbacks may be used with multiple interfaces like REST, XMLRPC, JSON, JSON-RPC, SOAP, AMF, etc. This allows a Drupal site to provide web services via multiple interfaces while using the same callback code.