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.
Gist Platform - Live chat, bots & marketing automation -- free.
phpMyFAQ - phpMyFAQ is a world’s most popular mobile-friendly, feature-rich and open-sources FAQ software that uses PHP 5.
Labidesk - LabiDesk is all-in-one help desk software for Omni Channel Support: Shared Email Inbox, Ticketing System, HelpWidget, Knowledge Base, Live Chat. Assist, Engage and Sell to your customers!
Support Hero - Educate your customers through self-help support