POSTGRESQL NOTE: If you need support for Postgresql, use Drupal 6 along with the Drupal 6 version of Queryable Variables. The drupal 5 version does NOT have support for PGSQL.
FreshBooks is a web based accounting application that makes it easy for you to track the time you spend on projects and invoice your clients. The company behind it is very web savvy and has managed to deliver a well documented, easy to use API for third party integration. This module aims to provide a full integration of the FreshBooks API for use by this and other Drupal modules.
Security: This module is considered insecure by Drupal security team and all of its releases have been unpublished. You are strongly encouraged to disable the module on your site. The Services module, from which Web Services was forked, may be a possible replacement depending on your requirements.
#D7CX: I pledge that Web Services module will have a full Drupal 7 release on the day that Drupal 7 is released.
Let other sites to communicate with your site with this AP, just like Google, Flickr, Facebook do! Choose which sites might publish content, change user information or simply integrate a Flash application with your site.
If you want to access other sites' services, you should take a look on Web Services API.
Features
Pluggable services: you might add new functionalities, allowing other sites do more and more with your site's data.
Pluggable authentication: it comes with a very simple authentication method, called DirectID. But you might use other. The recommended one for production sites is OAuth, version 2.x
Pluggable servers: the 1.0 version comes with XML-RPC server, but you can build other servers like popular REST and SOAP.
XHTML, PHP, Drupal and JavaScript code standards compliant