Chars - Unicode Symbols Keyboard for iOS
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
Smart Compose in Gmail - Write emails faster with Smart Compose in Gmail
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
EasyEmail - Gmail plug-in that helps you write emails quickly
MailClark - The Slack bot for external communications