Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates
GoSquared Live Chat - Beautiful, simple, and free live chat for your website
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
MailClark - The Slack bot for external communications