libssh2 is a library implementing the SSH2 protocol, available under the revised BSD license.
Web site: https://libssh2.org/
Mailing list: https://lists.haxx.se/listinfo/libssh2-devel
License: see COPYING
Source code: https://github.com/libssh2/libssh2
Web site source code: https://github.com/libssh2/www
Installation instructions are in: