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
NEWOLDSTAMP - Email signature generator
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
Exclaimer - Exclaimer is the industry's leading provider of email signature solutions, empowering businesses to unlock the potential of email as a key digital advertising channel.
DuoCircle - DuoCircle provides enterprise spam filtering and email management solutions.