The Advanced Bash Scripting Guide is both a reference and a tutorial on shell scripting. This comprehensive book, the equivalent of 1,000+ print pages, covers almost every aspect of shell scripting. It contains 382 profusely commented illustrative examples, a number of tables, and a cross-linked index/glossary. Not just a shell scripting tutorial, this book also provides an introduction to basic programming techniques, such as sorting and recursion. Included scripts are the Game of Life, a Perquackey variant, a Morse code trainer, and an implementation of the Gronsfeld Cipher. This book is suited for both individual study and classroom use. It covers Bash, up to and including version 4.2. Note that users of miniaturized single-board computers running Linux, such as the Raspberry Pi and the Beagle Bone, would find this Guide useful for learning and running Bash scripts to explore and expand the capabilities of these small, but powerful machines.
Bayonne is the telephony server of the GNU project. It offers a script-driven threaded multi-line state event telephony service on GNU/Linux, xBSD, and Microsoft Windows for building voice response systems, and uses telephony plugins for runtime driver configuration. It also features "TGI" for making Perl applications "telephony aware". It may be used to build telephony-based system administration, home automation, automated attendant, v-commerce, and voice messaging systems.
Ftwalk is a high level script programming language, very similar to awk, but greatly extended to include a richer type system, object-oriented features, 300+ built-in functions, extensibility through dynamic libraries, etc., which makes it roughly comparable to languages like Perl. It does file tree searches, and was originally used to implement selective redundant copy backup stores. It can be run interactively as a calculator.
NSC is a set of utilities for easy administration of DNS servers. You write very simple configuration files and NSC automatically generates zone files, reverse zone files, and configuration for the BIND. Among other things, it also supports classless reverse delegations and IPv6 addressing. NSC is written in POSIX shell and GNU M4, and it should run on all systems where these two languages are available. Generation of DNS daemon config files is currently limited to BIND 8 or 9, but it's very easy to add your own config file generators for other daemons.
SigLab is a calculator designed for working on signals. You can use it to load, save, or generate signals, and do various operations on and between signals (addition, log, abs, sin, filtering, convolution, fft, correlation, etc.). Signal parts are constantly displayed. SigLab was designed to be able to handle the results of simulations or measurements. It can handle signals with millions of points, keeping in memory a small piece of each signal. To keep good performance, it caches in memory signal portions. SigLab was specifically designed for Ptolemy users. It will start at the end of a simulation and show all asked signals.