Tiny SHell 0.6
This is a lightweight client/server clone of the standard remote shell tools (rlogin, telnet, ssh), which can act as a backdoor and provide remote shell execution as well as file transfers.
It is 8-bit clean, has full support for pseudo-terminal pairs (pty/tty), and uses strong 160-bit RC4 encryption. It can also operate in connect-back mode in order to bypass firewalls that block incoming connections. Most UNIX platforms are currently supported (Linux, BSD, Cygwin, SunOS, IRIX, HP-UX, and OSF).