Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
FreshRSS - FreshRSS is a free, self-hosted RSS aggregator.
Cypht - All your E-mail, from all your accounts, in one place. Cypht is like a news reader, but for E-mail.
Tiny Tiny RSS - Web-based news feed aggregator, designed to allow you to read news from any location, while feeling...
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
Feedly - The content you need to accelerate your research, marketing, and sales.