The metric implemented in the Image::Density Perl Module estimates the density of data where there is data, and has a reasonable correlation with goodness as judged by humans. That is, if you let a human look at a set of images and judge quality, the density values for those images as calculated here tend to correlate well with the human judgement (densities that are too high or too low represent "bad'' images). It is intended for use on bitonal TIFF images, such as those from scanning paper documents.
a2pdf converts plain (ASCII) text files to documents in the PDF format. Its features include optional line/page numbering, multiple font support, syntax highlighting for Perl source code, and customizable headers and footers. Binaries are available for Linux x86, Mac OS X (Intel), and Microsoft Windows platforms.
Yaacfi is an authentication, authorization, and access control filter for J2EE Web applications. This filter loosely emulates J2EE servlet container role based security with some extensions, and allows to easily implement login procedures for much more complicated user interaction schemes than the standard container-based security form login procedure. These schemas are required to provide cookie login, openid login, explicit login, etc. The filter is completely compatible with Struts.
Options.pm is a command-line option-parsing Perl module meant to imitate the syntax of the t.p.usage.Options module from the Twisted Python library. It will allow you to specify which options to look for on the command line, and supports both long and short versions of simple flags and parameters. If a required parameter is unspecified, Options.pm will print nicely formatted usage information with the error.
JSokoban is a port of the classic Macintosh puzzle game in which players try to shift the money bags of each level to a given position. The game comes with over 200 levels of varying difficulty, sound, unlimited undos/redos, and support for moving using both the keyboard and mouse.
innotop is a MySQL and InnoDB monitor that lets you view and manage what's happening inside your MySQL servers. Features include a top-like query list, a top-like InnoDB transaction list, and much more. This tool gives you a high level of insight into the inner workings of InnoDB.