PHP Shell is a shell wrapped in a PHP script. It's a tool you can use to execute arbiritary shell-commands or browse the filesystem on your remote Web server. This replaces, to a degree, a normal telnet-connection. You can use it for administration and maintenance of your Web site using commands like ps, free, du, df, and more.
makeself is a small shell script that generates a self-extractable compressed TAR archive from a directory. The resulting file appears as a shell script, and can be launched as is. The archive will then uncompress itself to a temporary directory and an arbitrary command will be executed (for example, an installation script). This is pretty similar to archives generated with WinZip Self-Extractor in the Windows world.
UDPCast allows to send data simultaneously to many destinations on a local net. This can for instance be used to install entire classrooms of PCs at once. The advantage over using other methods (nfs, ftp, whatever) is that udpcast uses Ethernet's multicast abilities: it won't take longer to install 15 machines than it would to install 2. The tool comes with a busybox bootdisk for easy loading of the tool. However, udpcast can also be started from the command line of an already installed system, and can be used for other purposes than just system installation.
FAI (fully automatic installation) is a non-interactive system to install a Debian GNU/Linux operating system on a group of PCs or a Linux cluster. After installation, the systems are fully configured and ready to run. It is a scalable method for performing unattended installation and updating. Changes to the configuration files of the operating system are made by cfengine, shell, and Perl scripts.
mkCDrec (Make CD-ROM Recovery) makes a bootable (El Torito) disaster recovery image, including backups of the Linux system to one or more CD-ROM(s) (multi-volume sets). Otherwise, the backups can be stored on another disk, NFS/CIFS disk, or (remote) tape. After a disk crash or system intrusion, the system can be booted from the CD-ROM and one can restore the complete system as it was. It also features disk cloning, which allows one to restore a disk to another disk (the destination disk does not have to be of the same size, as it calculates the partition layout itself). Currently, ext2, ext3, minix, MS-DOS, FAT, VFAT, Reiserfs, XFS, and JFS filesystems are supported. It can restore disks in Software RAID and LVM mode. It supports the One Button Disaster Recovery (OBDR) mode, which simulates a bootable CD-ROM on tape.
The ESP Package Manager (EPM) is a simple tool that generates software and patch distributions in various formats, including AT&T software packages ("pkg") used by Solaris, Debian ("dpkg"), HP-UX software packages ("swinstall" or "depot"), IRIX Software Manager ("inst" or "tardist"), portable (installation and removal scripts with tar files), and Red Hat Package Manager ("RPM").
Ved (visual editor) is a small and very fast screen-oriented text editor that implements a user interface somewhere between vi and Emacs. It is powerful and easy to learn, and has no limitations on line length, file size, or the types of characters that may appear in a file. It is a highly portable editor for Unix and most other OSes.
gitty-gitty, the (general | GNU) template generation tools, are a set of scripts for creating a whole set of sources which may already be compiled and installed using the GNU development tools. Think of gtgt as a program which is able to create an already compilable, very sophisticated "hello world" program, written in C or C++ and constituted by a main program, two internal modules (classes), and one static and one shared library, and this complex "Hello World" is already fully embedded into the GNU autoconf/automake development environment. By using gitty-gitty, you will get a template of sources for the main cases you might meet, and which you can also use as examples for automake, autoconf, etc.