Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
HelpDocs - Educate your users with a super simple knowledge base that’s built for teams just like yours.
Expensive Chat - Chatroom where you pay per letter
phpMyFAQ - phpMyFAQ is a world’s most popular mobile-friendly, feature-rich and open-sources FAQ software that uses PHP 5.
Messenger Platform - Discovery, chat extensions, and richer experiences