Userify - Userify is a cloud-based SSH key management solution.
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 …
Ganymed SSH-2 - Ganymed SSH-2 for Java is a library which implements the SSH-2 protocol in pure Java.
GnuTLS - GnuTLS (the GNU Transport Layer Security Library) is a free software implementation of the SSL, TLS...
FireSSH - After 13 years and 25 million downloads later, Firefox has officially removed FireFTP and FireSSH support from the browser. Thus, I've ended support / development of the addons. I recommend switching to Waterfox to continue using the addons.
mbed TLS - mbed TLS . PolarSSL . Easy to use SSL library in C . Embedded . Open source . Readable source code . Tested . Well-documented ✓