Gsh is a graphical shell. It integrates a terminal window, a normal shell, and various GUI components into a single package which allows easier and more powerful operations than you can have with a shell and terminal window seperately. Gsh is already fully functional, but there are many avenues of devlopment yet to be explored.
TN5250j is an AS400 Telnet 5250 written in Java. The emulator provides some of the more advance functions of the 5250 datastream such as edit masks, graphical windows, continued editing fields, etc. It includes a file transfer function to multiple formats such as Open Office and Excel via full SQL query statements, spool file exporting to text or PDF, the ability to email after transfer or export, scripting in Python via the jython language, and more.
krd eases the configuration and utilization of multiple connections to remote desktops. It's a rdesktop and VNC wrapper. You can configure almost all rdesktop and xtightvncviewer parameters and copy/paste/rename connections. It stores passwords safely with kwallet. You can save/manage sessions very easily using a menu. It supports preinit and postend scripts per connection, typically to start or stop SSH tunnel or VPN connections.
QuadKonsole is a terminal application that embeds Konsole kparts in a grid layout. This saves memory, provides faster startup, and makes it unnecessary to align your Konsole windows by hand. It also provides a lot more screen real estate, makes navigation easier by using arrow keys, and allows all Konsoles to minimized or maximized at once. It only occupies one slot in the taskbar.
Spinner is useful for keeping telnet and ssh links from dropping due to inactivity. Many firewalls and some ISPs drop connections when they are perceived as idle. By having spinner running, the server is constantly sent a tiny amount of data over the link, preserving the connection. Spinner thus acts as a keep-alive. It displays a little "spinning" ASCII character in the top left corner of your terminal. It supports any terminal capable of handling VT100-style escape codes. Spinner can also function transparently by only sending null characters to the terminal. In this mode Spinner supports any terminal. It also has a mode called "Ghost in the Machine" in which you can use Spinner to write the spinner character to any TTY, not just your own.