yaWP is a nice and simple plasmoid for KDE 4.x to show the weather forecast, works with different weather sources, you can configure it to show several days in advance, to display the current satellite image and it is also possible to keep track of multiple cities.

Clawsker is an applet to edit the so called Claws Mail hidden preferences.

OpenCL (Open Computing Language) is a multivendor open standard for general-purpose parallel programming of heterogeneous systems that include CPUs, GPUs and other processors.

This metapackage will install emulators.

KdeSudo is a graphical frontend for the sudo utility, which allows users to run programs as root (or another user) by giving their own password.