Stunnel is a program for creating an encrypted network tunnel, mainly for programs that do not support SSL. The input data is encrypted and appears decrypted or vice versa. The program allows the connection of two networks through an encrypted TCP tunnel, or ensure the operation of unencrypted protocols or daemons such as IMAP, MySQL, POP, IRC and more.
The distribution is under the GPL license, taking into account the restriction of the SSL license of the library under which it is compiled.