WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
Signaturely - Super simple eSignature software
Mailcastr - Create email signature that tells when your email is read.✉️
Woleet Sign - eSignatures secured by Bitcoin
MySignature - MySignature is FREE Email Signature Generator that helps to create Professional Signatures for major email clients such as Outlook, Gmail...
HTMLCSS to Image API - Convert HTML to an image (jpg, png, webp). Renders images exactly like Google Chrome. Works with PHP, JavaScript, Ruby, .NET and more.