Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
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
Mailcastr - Create email signature that tells when your email is read.✉️
MailClark - The Slack bot for external communications
Mailbum - Email signatures without the fuss