Some suggestions for encrypted messaging services built as open-source software
* https://peerio.com - encrypted messaging and file sharing where you dont need to learn about GPG encryption. Required for all recipients. Cannot be used with regular email addresses.
* https://mega.nz/ - encrypted online file storage. Mega allows you to share the file with another Mega user or externally, provided you can get the link to them securely.
You can always turn to a proprietary solution (e.g. http://www.symantec.com/desktop-email-encryption) but we cannot recommend any commercial solutions, especially those who do not disclose their code for inspection.
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