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Stonly Knowledge Base - Interactive knowledge bases and help-centers
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Free Knowledge Base by Dashly - Optimize your customer support with Knowledge Base by Dashly
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.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.