Bashupload - Upload files from command line to share between servers
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
FilePizza - Open source application used to transfer file via WebRTC and WebTorrent.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
BlackHole File Transfer - Blockchain-based file transfer. Designed for everyday use.
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.