Get all the essentials with a free email marketing account from Cakemail.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
BizConnector - BizConnector offers marketing and workflow automation solutions to small businesses.
HEY - Email at its best, new from Basecamp.
HubSpot - Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.