The stmpclean utility removes old files (and old empty directories) from the specified directory. It is meant to be used to clean directories such as "/tmp" where old files tend to accumulate. stmpclean never removes files or directories owned by root, which is a feature, not a bug. Great care is taken while descending into the directory, and the operation is secure. Anything that's not a directory, regular file, or symbolic link is also left alone (because programs like screen(1) create sockets and FIFOs under /tmp and expect them to be long-lived). Unlike other programs that do the same task, stmpclean never forks and consumes limited amount of memory. If stmpclean determines a race condition it will log the situation and exit with a failure.
stowES (stow Enhancement Script) is a Perl script which tries to ease the use of the "stow" packaging program and software which can be compiled and installed with autoconf. It automates the compilation and installation of software packages and provides some useful functions to maintain your stow packages (e.g., list packages, check packages for integrity, etc.).
suPHP is a combination of an Apache module (mod_suphp) and an executable which provides a wrapper for PHP. With both together, it is possible to execute PHP scripts with the permissions of their owner without having to place a PHP binary in each user's cgi-bin directory. suPHP doesn't need Apache's suExec, and provides a logging function.
sud (superuser daemon) permits a user to switch to root privileges and to use a suid program in a nosuid environment. It is based on a client/server model and on the ability to pass file descriptors between processes. sud permits you to choose your authentication method, and your effective credentials will be checked by using a Unix domain socket.
sudosh can be used as a default login shell or a filter that takes advantage of PTY devices in order to sit between the user's keyboard and a program, in this case a shell. It was designed specifically to be used in conjunction with sudo, and allows the execution of a root or application shell with logging. It is basically a VCR and will record root shell sessions and also has the ability to play back the sessions as they were originally recorded. It records all input/output, keyboard input, and timing information so that the session can be played back in the original format.