Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
HelpSite - HelpSite is a simple service to help your setup the perfect support centre or help site.
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
Manula - Manula is an online software for creating user manuals.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
SlimFAQ - Build an FAQ quickly and easily for your website