Free eSign Plan from PandaDoc - Legally-binding eSignatures 100% free with new PandaDoc plan
WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
GetAccept - GetAccept is a Sales tool for electronic signatures and sales document automation.
NEWOLDSTAMP - Email signature generator
DottedSign - The Best E-Signature Solution for Your Business
Sigstr - Email signature marketing