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Stunnel
Stunnel is a free multi-platform computer program, used to provide universal TLS/SSL tunnelling service.
Stunnel can be used to provide secure encrypted connections for clients or servers that do not speak TLS or SSL natively. It runs on a variety of operating systems, including most Unix-like operating systems and Windows. It relies on a separate library such as OpenSSL or SSLeay to implement the underlying TLS or SSL protocol.
Stunnel uses Public-key cryptography with X.509 digital certificates to secure the SSL connection. Clients can optionally be authenticated via a certificate too.
If linked against libwrap, it can be configured to act as a proxy-firewall service as well.
Stunnel is maintained by Michal Trojnara and Brian Hatch. Released under the terms of the GNU General Public License.