Drupal Aid - Drupal Support and Maintenance Services
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Content Marketing for Drupal - More traffic for your Drupal websites by StoryChief
HelpDocs - Educate your users with a super simple knowledge base that’s built for teams just like yours.
phpMyFAQ - phpMyFAQ is a world’s most popular mobile-friendly, feature-rich and open-sources FAQ software that uses PHP 5.
Support Hero - Educate your customers through self-help support