Stonly Knowledge Base - Interactive knowledge bases and help-centers
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Free Knowledge Base by Dashly - Optimize your customer support with Knowledge Base by Dashly
Influitive - Influitive helps companies increase customer lifetime value and accelerate sales with the power of their own customer advocates. Inspire your customers to stay longer, share their experiences, and attract new business.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.