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Class::Inspector allows you to get information about a loaded class. Most or all of this information can be found in other ways, but they aren't always very friendly, and usually involve a relatively high level of Perl wizardry, or strange or unusual looking code. Class::Inspector attempts to provide an easier, more friendly interface to this information.

The Config::Objective module provides a mechanism for parsing config files to manipulate configuration data. Unlike most other config file modules, which represent config data as simple variables, Config::Objective represents config data as perl objects. This allows for a much more flexible configuration language, since new classes can be easily written to add methods to the config syntax.

Data::Alias is a module that allows you to apply "aliasing semantics" to a section of code, causing aliases to be made wherever Perl would normally make copies instead. You can use this to improve efficiency and readability, when compared to using references.

This is a collection of miscellaneous subroutines useful in wide but varying scenarios; a catch-all module for things that don't obviously belong anywhere else. Obviously what's useful differs from person to person, but this particular collection should be useful in object-oriented frameworks, such as Class::Scaffold and Data::Conveyor.

Data::Peek started off as DDumper being a wrapper module over Data::Dumper, but grew out to be a set of low-level data introspection utilities that no other module provided yet, using the lowest level of the perl internals API as possible.

Excel uses a different system for its dates than most Unix programs. This module allows you to convert between a few of the Excel raw formats and DateTime objects, which can then be further converted via any of the other DateTime::Format::* modules, or just with DateTime's methods.

This module understands the formats used by MySQL for its DATE, DATETIME, TIME, and TIMESTAMP data types. It can be used to parse these formats in order to create DateTime objects, and it can take a DateTime object and produce a string representing it in the MySQL format.

This module understands the formats used by SQLite for its DATE, DATETIME, TIME, and TIMESTAMP data types. It can be used to parse these formats in order to create DateTime objects, and it can take a DateTime object and produce a string representing it in the SQLite format.

The Devel::SmallProf profiler is focused on the time taken for a program run on a line-by-line basis. It is intended to be as "small" in terms of impact on the speed and memory usage of the profiled program as possible and also in terms of being simple to use.

The Devel::Profile package is a Perl code profiler. This will collect information on the execution time of a Perl script and of the subs in that script. This information can be used to determine which subroutines are using the most time and which subroutines are being called most often.