CodeTwo Email Signatures for Office 365 is a cloud-based software that lets you create and centrally manage email signatures and disclaimers for all users in your Office 365 tenant. The service is easy to set up and works with all email clients (including mobile devices).
Letsignit is a centralized solution for managing professional email signatures.
WiseStamp is an innovative email signature generator that enables freelancer, self-employed individuals, and businesses to create professional and dynamic email signatures. The solution allows users to create email signatures for Outlook, Gmail, iPhone, Apple Mail, and Yahoo.