Plack is a set of tools for using the PSGI stack. It contains middleware components, a reference server, and utilities for Web application frameworks. PSGI allows Web application framework developers to only write an adapter for PSGI. End users can choose from among all the backends that support the PSGI interface: CGI, FastCGI, mod_perl, the Nginx perl module, and standalone servers.
Job-Machine is a small, but versatile system for sending jobs to a message queue and, if necessary, communicating answers back to the sender. Job::Machine uses LISTEN / NOTIFY from PostgreSQL to send signals between clients and workers. This ensures very efficient message passing, giving any worker that is awake the chance to start working immediately.
Morpheus is a Perl module that implements a configuration engine that completely separates config consumers from config providers. Consumers can obtain configuration values by using this module or the morph script. Configuration values are bound to various nodes in the global configuration tree, similar to a virtual file system. Consumers can ask for any node or for any subtree. Providers are plugins which can populate the configuration tree from any sources, such as local configuration files, configuration database, and the environment. The overall program configuration is merged together from all data provided by plugins.
C-DynaLib is a Perl module that allows Perl programs to call C functions in dynamic libraries. It is useful for testing library functions, writing simple programs without the bother of XS, and generating C function pointers that call Perl code. If you have a C compiler that Perl supports, you will get better results by writing XSubs than by using this module.
EWS-Client is a module that acts as a client to the Microsoft Exchange Web Services API. From it you can access calendar and contact entries in a nicely abstracted fashion. Query results are generally available in an iterator and convenience methods exist to access the properties of each entry.