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QPDF is a program that can be used to linearize (web-optimize), encrypt (password-protect), decrypt, and inspect PDF files from the command-line. It does these and other structural, content-preserving transformations on PDF files, reading a PDF file as input and creating a new one as output. It also provides many useful capabilities to developers of PDF-producing software or for people who just want to look at the innards of a PDF file to learn more about how they work. QPDF understands PDF files that use compressed object streams (supported by newer PDF applications) and can convert such files into those that can be read with older viewers. It can also be used for checking PDF files for structural errors, inspecting stream contents, or extracting objects from PDF files. QPDF is not PDF content creation or viewing software -- it does not have the capability to create PDF files from scratch or to display PDF files.

The mcron program represents a complete re-think of the cron concept originally found in the Berkeley and AT&T unices, and subsequently rationalized by Paul Vixie. The original idea was to have a daemon that wakes up every minute, scans a set of files under a special directory, and determines from those files if any shell commands should be executed in this minute. The new idea is to read the required command instructions, work out which command needs to be executed next, and then sleep until the inferred time has arrived. On waking the commands are run, and the time of the next command is computed. Furthermore, the specifications are written in scheme, allowing at the same time simple command execution instructions and very much more flexible ones to be composed than the original Vixie format. This has several useful advantages over the original idea.

'tbku' is a utility script for producing "tarball" backups of some- or all of your files. It is useful both for producing incremental backups or for systemwide images or "snapshots". The script can be run either from the command line or, more typically, as a cron job to automate system backup tasks. The central benefit of using 'tbku' over hand written tar commands is that 'tbku' is "table driven". You specify the set of files to back up in a table (a separate file). You can have as many of these "filesets" as you wish, corresponding to different kinds of backups you want done. 'tbku' will do backups automatically or manually, based on the name of the "fileset". This considerably simplifies automating backups, keeping backup logs, and generally maintaining an orderly backup environment. 'tbku' can also be used to capture system images which can then later be used to (re)provision other machines.

Apache JMeter is a 100% pure Java desktop application designed to load test functional behavior and measure performance. It was originally designed for testing Web Applications but has since expanded to other test functions. Apache JMeter may be used to test performance both on static and dynamic resources (files, Servlets, Perl scripts, Java Objects, Data Bases and Queries, FTP Servers and more). It can be used to simulate a heavy load on a server, network or object to test its strength or to analyze overall performance under different load types. You can use it to make a graphical analysis of performance or to test your server/script/object behavior under heavy concurrent load. In addition to load-testing, the tool can also be used to verify correctness of your web-applications.

Many audio synthesis and recording packages are in use or in development. These work in many different ways. LADSPA provides a standard way for `plugin' audio processors to be used with a wide range of these packages. For instance, this allows a developer to make a reverb program and bundle it into a LADSPA `plugin library.' Ordinary users can then use this reverb within any LADSPA-friendly audio application.

DBIx::Connector provides a simple interface for fast and safe DBI connection and transaction management. Connecting to a database can be expensive; you don't want your application to re-connect every time you need to run a query. The efficient thing to do is to hang on to a database handle to maintain a connection to the database in order to minimize that overhead. DBIx::Connector lets you do that without having to worry about dropped or corrupted connections.

Module::Build is a system for building, testing, and installing Perl modules. It is meant to be a replacement for ExtUtils::MakeMaker. Developers may alter the behavior of the module through subclassing in a much more straightforward way than with MakeMaker. It also does not require a make on your system - most of the Module::Build code is pure-perl and written in a very cross-platform way.

This module define a subroutine that let you evaluate Perl code in a specific context. The code can be passed directly as a string or as a file name to read from. It also provides some subroutines to let you define and optionally share variables and subroutines between your code and the code you wish to evaluate. Finally there is some support for running your code in a safe compartment.

libxo - A Library for Generating Text, XML, JSON, and HTML Output The libxo library allows an application to generate text, XML, JSON, and HTML output using a common set of function calls. The application decides at run time which output style should be produced. The application calls a function "xo_emit" to product output that is described in a format string. A "field descriptor" tells libxo what the field is and what it means.

Class related functionality in Perl is broken up into a variety of different modules. Class::Handle attempts to provide a convenient object wrapper around the various different types of functions that can be performed on a class. Currently, Class::Handle provides what is effectively a combined API from UNIVERSAL, Class::ISA and Class::Inspector for obtaining information about a Class, and some additional task methods, such as load to common tasks relating to classes.