Pithos - pithos is a daemon which provides an S3-compatible frontend for storing files in a Cassandra cluster.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Keybase Chat - End-to-end encrypted chat built into Keybase
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.