OpenSSH (OpenBSD Secure Shell) is a set of computer programs providing encrypted communication sessions over a computer network using the SSH protocol. It was created as an open source alternative to the proprietary Secure Shell software suite offered by SSH Communications Security.
OpenSSH is developed as part of the security conscious OpenBSD project, which is led by Theo de Raadt. The project's development is funded via donations.
Read more about OpenSSH: History, Development and Structure, Features, Trademark