Roundcube - Web-based IMAP email client
Google Calendar - Spend less time managing your day & more time enjoying it
HEY - Email at its best, new from Basecamp.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
iCal - In Calendar on your Mac, subscribe to calendars published or shared by others.