There are tens of CMS, eCommerce and web frameworks available in 10+ programming languages until date. Many are designated for specific fields of life while a set of them are in existence for solely web development and web enabled commerce purpose.
Drupal stands out of the crowd and it is number one CMS software for its flexibility and liberty allowed to control it.
If it is competition of ecommerce packages, Drupal is one of top 5 candidates in total, considering proprietary programs also.
Drupal has APIs for everything, like
1.Salesforce Drupal API
2.YouTube Drupal API
3.Twitter Drupal API
4.Google Apps API
5.AdSense Drupal API
6.Sugar CRM for Drupal API
7.Mailchimp Drupal API
8.Constant Contact Drupal API
9.Facebook Drupal API
10.Ubercart Drupal API
11.Google Analytics Drupal API
..and what not ?
Keep no doubt in mind for legality related conflictions, all above are free and
direct download is served at Drupal.org
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