WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
Petit Hacks - Acquisition, retention, & revenue hacks used by companies
NEWOLDSTAMP - Email signature generator
Growth.Design Case Studies - Product tips… in a comic book format
Sigstr - Email signature marketing
POWr - POWr is a library of free and customizable forms, galleries, social streams, e-commerce, countdowns, and more.