sdelta analyzes two files and outputs the difference. It applies the difference to the first of the original files to construct a bit for bit clone of the second file. It is optimized for use with source tarballs, and also contains sdreq, the client for the Public Patch Repository, PPR. The PPR generates on demand source upgrade and downgrade patches for over a quarter of a million version specific source tarballs. By using sdreq you can acquire new source tarballs from the PPR several times faster and with only 10% of the downloading that you currently do.
sdparm has a command line interface for getting and setting SCSI mode page fields. Fields can be referred to by an acronym or a numerical address. It has support for various SCSI transport and vendor-specific mode pages. It also decodes Vital Product Data (VPD) pages and can send some simple SCSI commands. sdparm was originally written for Linux with ports to FreeBSD, Solaris, Tru64, and Windows.
sdvplayer is a tool to help you improve your vocabulary in a foreign language by watching movies with subtitles in that language. It allows you to look up the meaning of a word displayed in the subtitles just by clicking on it. The meaning will be printed right on the screen and the player will be paused. Playing can be resumed just by pressing the space bar. It can play movies in many of the formats supported by libav*. Subrip (.srt), microDVD, and subviewer subtitle formats are supported. The meaning can be looked up through an external command. The built-in dictionary parser can parse the stardict dictionary format.
se is a screen-oriented version of the classic UNIX text editor ed. The editor implements many of the commands of ed, but instead of being line-oriented, se is screen-oriented. The command syntax is very familiar to users who already know ed. If you get stuck, there is a built-in help system that describes many of the available commands. Many configurable options can be loaded from a .serc file. se can be run interactively or in a script via the included scriptse utility. The editor is portable across many platforms, supporting major Linux and BSD distributions as well as other systems like GNU, Minix, Haiku, OpenSolaris, and Cygwin.
The seccure toolset implements a selection of asymmetric algorithms based on elliptic curve cryptography (ECC). In particular, it offers public key encryption / decryption, signature generation / verification and key establishment. ECC schemes offer a much better key size to security ratio than classical systems (RSA, DSA). Keys are short enough to make direct specification of keys on the command line possible (sometimes this is more convenient than the management of PGP-like key rings). seccure builds on this feature and therefore is the tool of choice whenever lightweight asymmetric cryptography -- independent of key servers, revocation certificates, the Web of Trust, or even configuration files -- is required.
sectool is a security tool for RPM based distributions. It can be used for security auditing and intrusion detection. Its goal is to catch mistakes caused by admins or point out things that they were not aware of. It checks system configuration and suspicious settings. It's easily extensible with language independent tests.