from version 0.67-2 on Kubuntu

putty

Telnet/SSH client for X

This is the Unix port of the popular Windows SSH client, PuTTY. It supports flexible terminal setup, mid-session reconfiguration using Ctrl-rightclick, multiple X11 authentication protocols, and various other interesting things not provided by ssh in an xterm.
PuTTY terminal emulator

pterm

PuTTY terminal emulator

This is an X terminal emulator based on the popular Windows SSH client, PuTTY. It supports xterm escape sequences, plus some Linux console sequences for colour palette configuration and some DECterm sequences for title bar control, and with an appropriate font it supports the UTF-8 encoding of Unicode. It also has some nifty features like rectangular selection and NetHack keypad mode.
Dot and Boxes game

ksquares

Dots and Boxes game

KSquares is a game where two players take turns connecting dots on a grid to complete the most squares.
compare "dmesg" from "util-linux" with "journalctl -k"

systemd

system and service manager

systemd is a system and service manager for Linux. It provides aggressive parallelization capabilities, uses socket and D-Bus activation for starting services, offers on-demand starting of daemons, keeps track of processes using Linux control groups, maintains mount and automount points and implements an elaborate transactional dependency-based service control logic.
wire puzzle game

knetwalk

wire puzzle game

KNetwalk is a puzzle game where the player arranges sections of wire to connect all the computers on the board.
1. box shows shell comment box, 2. box shows a dog with horizontal centered text

boxes

textmode box- and comment drawing filter

Boxes is extremely configurable filter for adding and removing ASCII art (comments, for example) around chunks of text. Most modern text editors support filtering text through external filters. Boxes is such a filter.