Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.
GnuPG allows to encrypt and sign your data and communication, features a versatile key management system as well as access modules for all kinds of public key directories.
RetroShare is a open source cross-platform, private and secure decentralized communication system.
Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
MsgSafe.io provides private, encrypted, online communication with layers of security you can trust.
The Bat! is a secure email client software, built to protect your correspondence against third-parties. .
MailMate is an IMAP email client for Mac featuring extensive keyboard control, Markdown supported email composition.
A mail service which meets all needs- For individuals: free or Premium (1€/month) Mailo accounts
FlowCrypt (formerly CryptUp) is the easiest PGP encryption for Gmail. It behaves just like standard email, except it's encrypted.
Android Privacy Guard (APG) is a free and open source application for...
WinGPG is a tray-based classical Windows application, Windows NT Explorer shell extension, and a classic GPGv2 distribution.
Privatoria.net is a service which provides secure communication, anonymous surf and secure file sharing for individuals and business.
Autocrypt is a set of guidelines for developers to achieve convenient end-to-end-encryption of e-mails.No screenshots yet
A GnuPG Frontend GUI made in C#. It is compatible with PGP as well so it can be a very useful tool for encryption/decryption.