OpenSSL - OpenSSL is a free and open source software cryptography library that implements both the Secure Sockets Layer (SSL) and the Transport Layer Security (TLS) protocols, which are primarily used to provide secure communications between web browsers and …

Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.

mbed TLS - mbed TLS . PolarSSL . Easy to use SSL library in C . Embedded . Open source . Readable source code . Tested . Well-documented ✓

Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.

GnuTLS - GnuTLS (the GNU Transport Layer Security Library) is a free software implementation of the SSL, TLS...

OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.