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From the safecat README: safecat is an implementation of D. J. Bernstein's maildir algorithm. It can be used to write mail messages to a qmail-style maildir, or to write data to a "spool" directory reliably. There are no lockfiles with safecat, and nothing is left to chance. If safecat returns a successful exit status, then you can be (practically) 100% sure your data is safely committed to disk. Further, if data is written to a directory using safecat (or other implementations of the maildir algorithm), then every file in that directory is guaranteed to be complete. If safecat fails to write all of the data, there will be no file at all in the destination directory. Of course, you know that such a thing cannot be: between UNIX and the different hardware options available, a 100% guarantee is not possible. However, safecat takes every precaution possible in writing your data.

scprotect is implementation of system call for setting or unsetting P_PROTECTED flag. It's similar to madvise(2) behaviour MADV_PROTECT, but may be used for already running processes. Also rc.d/scprotect scripts allow you to set protection flag even if process was restarted by user.

`skill' is a program which sends signals to processes given any combination of user names, ttys, commands, and pids. `snice' is a program which changes the priority of processes (given the same). It's actually one program which examines argv to determine what action is to be taken on matching processes. It is similar to kill(1) and renice(8), however the command line is completely order independent. There are also verbose, search, and interactive modes of operation. The name `skill' stems from `SuperKILL', but if you use it under `csh', you may discover another reason for calling it `skill' (hint "s!!").

Sloth allows you to slow down a specified application by specifying (in miliseconds) the delay on the process. It slows down the process by sending SIGSTOP & SIGCONT signals to the process over a very fast period of time, giving the appearance of a slower application.

slst generates statistics from the output of syslog. With slst one can find tendencies and unexpected changes in the behaviour of the running processes.

Last File Manager - lfm - is a simple 'midnight commander'-type file manager. It includes a simple file viewer, pyview. Lfm is a curses-based application for the UNIX console.

Terminal mixer can start processes inside a pseudo-terminal, which can be accessed through a Unix socket, TCP or even raw ethernet (not yet ported to FreeBSD). The programs can be linked to the current terminal, or they can be unlinked like in nohup. But even in this latter case you can connect to them using the mentioned protocols. tm can also start programs as if they communicate through pipes instead of terminals, and this can be quite useful for remote-controlling applications. More than one client can connect to the served pseudo-terminal, either using tm as a client or telnet for TCP. You can choose if they are only allowed to read, or they can also contribute on input.

Tentakel is a program for executing the same command on many hosts in parallel using various remote methods. It can make use of several sets of hosts that are defined in a configuration file as groups. It also supports an interactive mode that can be used for repeated commands.

The tmpwatch utility recursively searches through specified directories and removes files which have not been accessed in a specified period of time. Tmpwatch is normally used to clean up directories which are used for temporarily holding files (for example, /tmp). Tmpwatch ignores symlinks, won't switch filesystems and only removes empty directories and regular files.

Duplicity backs directories by producing encrypted tar-format volumes and uploading them to a remote or local file server. Because duplicity uses librsync, the incremental archives are space efficient and only record the parts of files that have changed since the last backup. Because duplicity uses GnuPG to encrypt and/or sign these archives, they will be safe from spying and/or modification by the server.