PerlPanel draws a small taskbar on your screen to display some useful widgets like a programs menu, some shortcut icons, a system tray and so on. It's similar to the Windows Taskbar, the GNOME Panel, and KDE's Kicker.

killer is a perl script that gets rid of background jobs. Background jobs are defined as processes that belong to users who are not currently logged into the machine. Jobs can be run in the background (and are exempt from *killer*'s actions) if their scheduling priority has been reduced by increasing their nice(1) value or if they are being run through condor.

duck, the Debian Url ChecKer, processes several fields in the debian/control, debian/upstream, debian/copyright, debian/patches/* and systemd.unit files and checks if URLs, VCS links and email address domains found therein are valid.

IRAF is the "Image Reduction and Analysis Facility". The main IRAF distribution includes a good selection of programs for general image processing and graphics.

FreeFem++ is an implementation of a language dedicated to the finite element method. It enables you to solve Partial Differential Equations (PDE) easily.