A modern, fast web-mail client with user-friendly encryption and privacy features. 100% Free and Open Source software
When it comes to email, it should be secure, fast and free. And, that is what MailPile claims to provide. Where you have full control over your email with all the data residing on your own server. There are many other open source email clients available in the market but this one has a seriously refreshing new interface!
More at: http://www.mailpile.is/