C
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libssh (License: LGPL)
libssh is a mulitplatform C library implementing the SSHv2 and SSHv1 protocol on client and server side. With libssh, you can remotely execute programs, transfer files, use a secure and transparent tunnel, manage public keys and much more ... - libssh2 (License: BSD)
github - libssh2
libssh2 is a library implementing the SSH2 protocol, available under the revised BSD license.
PHP
- pssht
pssht is a PHP library that provides an SSH server that can be embedded in other applications.