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Pam_helper is a small utility which allows non-PAM, or non-setuid applications to make use of PAM's authentication services. It was mainly created to allow gnome-screensaver to make use of PAM, but any application could use it. It accepts two arguments, the PAM service name, and a username. It reads the user's password from stdin.

xspy is a utility for monitoring keypresses on remote X servers. It takes advantage of an oversight in X Windows (R5 & R6) to find out about keypresses even in "secure mode". It works by polling the keyboard, by default every hundredth of a second.

ScanSSH supports scanning a list of addresses and networks for open proxies, SSH protocol servers, Web and SMTP servers. Where possible ScanSSH, displays the version number of the running services. ScanSSH protocol scanner supports random selection of IP addresses from large network ranges and is useful for gathering statistics on the deployment of SSH protocol servers in a company or the Internet as whole.

SoftEther VPN ("SoftEther" means "Software Ethernet") is a powerful, multi-OS and easy-to-use multi-protocol VPN software. It supports SSL-VPN (HTTPS), as well as OpenVPN, IPsec, L2TP, MS-SSTP, L2TPv3 and EtherIP tunneling protocols and has a clone function to support OpenVPN clients.

A SSLv3/TLS and SSLv2 proxy server that sniffs SSL/TLS packets and prints out the contents of packets in stdout. It can also serve as a (not very efficient) proxy server. Note that this tool does not decrypt or even attempt to decrypt the traffic that is routed through it.

This is the CU version of sudo. Sudo is a program designed to allow a sysadmin to give limited root privileges to users and log root activity. The basic philosophy is to give as few privileges as possible but still allow people to get their work done.

This is GNU Bash. Bash is the GNU Project's Bourne Again SHell, a complete implementation of the POSIX.2 shell spec, but also with interactive command line editing, job control on architectures that support it, csh-like features such as history substitution and brace expansion, and a slew of other features.

Osh is a re-implementation of the old and obsolete shell version, which was in standard use up to UNIX 6th Edition and was supplied as osh with UNIX 7th Edition. Its command language is a sparse subset of those of modern shells and is mostly common both to sh(1) and csh(1).

Term::ShellUI uses the history and autocompletion features of Term::ReadLine to present a sophisticated command-line interface to the user. It tries to make every feature that one would expect to see in a fully interactive shell trivial to implement. You simply declare your command set and let ShellUI take care of the heavy lifting.

rssh is a restricted shell for use with OpenSSH, allowing only scp and/or sftp. It now also includes support for rdist, rsync, and CVS. For example, if you have a server which you only want to allow users to copy files off of via scp, without providing shell access, you can use rssh to do that.