Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
data.world - The social network for data people
tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
Datawhale - Powerful people data for enterprises.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
DataQuest Beta - Codecademy for Data Science