Good Sales Emails - Best sales emails from great companies
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
Good Email Copy - Email copy from great companies.
HEY - Email at its best, new from Basecamp.
Growbots Email Timing Optimizer - Find the perfect time to send your email
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.