WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
Q-Stats - Get free marketing insights for every question on Quora.
NEWOLDSTAMP - Email signature generator
Site Rank Data - View historical rank information of websites via time series charts.
Sigstr - Email signature marketing
HypeStat - HypeStat is free statistics and analytics service, where you can find information about every website.