Search::Xapian is a Perl XS frontend to the Xapian C++ search library. It is a fairly complete wrapper: most features of the Xapian library are made available for use from Perl. Xapian is a highly adaptable toolkit that allows developers to easily add advanced indexing and search facilities to their own applications. It supports the Probabilistic Information Retrieval model as well as a rich set of boolean query operators. It's fast and scalable to hundreds of millions of documents.
Catalyst is a Web application framework for Perl. It is based on Maypole, and adds many features from Ruby on Rails, Struts, Spring, and Tomcat. The development philosophy focuses on Don't Repeat Yourself, Lego-like components, Code Generation, and very strong testability. It supports a number of plugins, models, views, and controllers.
IO::AIO implements fully asynchronous I/O (not non-blocking I/O) that lets your program stay in control and interactive even when doing heavy disk (or other) I/O. It provides asynchronous versions of read(), write(), open(), stat(), unlink(), rename(), utime(), readlink(), and most other standard syscalls as well as interfaces to sendfile(), readahead(), and other esoteric syscalls, complete with emulation on systems that don't support them. It also offers convenience functions to load whole files and more. It fits naturally into any event loop model, supports 9 priorities and request grouping.
WWW::PkgFind watches Web sites, FTP sites, GIT repositories, etc. for new code releases, and downloads them. In other words, it's like a Web spider tuned for downloading software packages and patches. It is also able to generate a queue of incoming packages, to allow subsequent processing (such as running tests on them).
Autodia is a command line Perl application that generates UML class diagrams from source code, SQL, and database connections. It supports multiple programming languages including SQL, and can output images (using GraphViz/VCG/SpringGraph), Dia XML and Umbrello XML, or custom formats using templates.
check_afs_rpc is a Nagios plugin for checking AFS file servers to see if there are client connections waiting for a free thread. If there are more than a few of these, AFS performance tends to be very slow; this is a fairly reliable way to catch overloaded file servers. By default, check_rxdebug returns a critical error if there are more than eight connections waiting for a free thread, and a warning if there are more than two. These thresholds can be changed with the --critical and --warning options. check_afs_rpc will always print out a single line of output including the number of blocked connections, and displaying whether this is critical, a warning, or okay.