Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
HelpDocs - Educate your users with a super simple knowledge base that’s built for teams just like yours.
Drift - A messaging app that helps you grow your business.
phpMyFAQ - phpMyFAQ is a world’s most popular mobile-friendly, feature-rich and open-sources FAQ software that uses PHP 5.
typedesk - A shortcut to all your canned responses
Support Hero - Educate your customers through self-help support