MailChimp - MailChimp is the best way to design, send, and share email newsletters.
GetNotify - GetNotify is a free email tracking software solution.
Constant Contact - Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.
Bananatag - Find out what happens to your emails after you press send! Add email tracking, attachment tracking, email scheduling and templates to your daily emails.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
Intelliverse Email Tracker - Intelliverse Email Tracker provides insights to increase the productivity of your emails.