Virtru - Virtru is your data privacy force field, wrapping and protecting emails and files wherever they're shared. Easy-to-use data security software for business. People also askIs Virtru Hipaa compliant?
TheLetterEncrypter - TheLetterEncrypter is a small (14KB download) AES-based text-encryption program.
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
CTI Text Encryption - CTI Text Encryption is an encryption tool that can encrypt any text from messages and articles to codes, etc.
Encyro - Use Encyro to send sensitive messages and files to your customers and service providers, including accountants, loan officers, health coaches, and others. Stay organized and forward documents from your mobile device.
GNUPGK - A GnuPG Frontend GUI made in C#.