IM account setup

pidgin

graphical multi-protocol instant messaging client

Pidgin is a graphical, modular instant messaging client capable of using multiple networks at once. Currently supported out of the box are: Jabber/XMPP, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, Lotus Sametime, SIMPLE, and Zephyr. It can support many more with plugins.
Debian 10 / KDE Plasma 5.8.7

pavucontrol

PulseAudio Volume Control

PulseAudio Volume Control (pavucontrol) is a simple GTK+ based volume control tool (mixer) for the PulseAudio sound server. In contrast to classic mixer tools this one allows you to control both the volume of hardware devices and of each playback stream separately. It also allows you to redirect a playback stream to another output device without interrupting playback.
Default KDE Desktop

kde-standard

KDE Plasma Desktop and standard set of applications

The KDE Software Compilation is the powerful, integrated, and easy-to-use Free Software desktop platform and suite of applications.
standards-compliant, fast, light-weight and extensible window manager

openbox

standards-compliant, fast, light-weight and extensible window manager

Openbox works with your applications, and makes your desktop easier to manage. This is because the approach to its development was the opposite of what seems to be the general case for window managers. Openbox was written first to comply with standards and to work properly. Only when that was in place did the team turn to the visual interface.
Funny turn-based artillery game, featuring fighting hedgehogs!

hedgewars

Funny turn-based artillery game, featuring fighting hedgehogs!

Each player controls a team of several hedgehogs. During the course of the game, players take turns with one of their hedgehogs. They then use whatever tools and weapons are available to attack and kill the opponents' hedgehogs, thereby winning the game. Hedgehogs may move around the terrain in a variety of ways, normally by walking and jumping but also by using particular tools such as the "Rope" or "Parachute", to move to otherwise inaccessible areas. Each turn is time-limited to ensure that players do not hold up the game with excessive thinking or moving.
mac

cairo-dock

Metapackage for cairo-dock

Cairo-dock has a family-likeness with OS X dock, but with more options. It uses cairo to render nice graphics, and Glitz to use hardware acceleration. It's fully configurable and can be a taskbar too. You can easily plug applets into it.