MailChimp - MailChimp is the best way to design, send, and share email newsletters.
GetResponse - Email marketing from GetResponse. Send email newsletters, campaigns, online surveys and follow-up autoresponders. Simple, easy interface. FREE sign up.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
HubSpot - HubSpot is an inbound marketing and sales platform that helps companies attract visitors, convert leads, and close customers.
Constant Contact - Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.
Pardot - Salesforce B2B marketing automation