Cool exotic applications
Inspired by a similar thread in Archlinux.org forums I'm starting this thread here for everyone to list some cool, but not so known applications that you may be using and would like to recommend to others.
I'll start with some examples that I've found to be quite impressive:
gmrun - a great yet simple and fast replacement for the "run command" dialog of the given window manager. It is especially useful on minimal window managers such as flux/black/openbox. I've set it up to show when pressing ctrl-f2 on my openbox setup. You can even run real bash commands within it which makes it awesomly useful if you need to launch a program with some special options for example.
Alltray - Allows you to put any of the open windows to tray which might sometimes be useful to minimize the use of your desktop space. I've set it to open on ctrl-s shortcut and then just click on the window which I want "trayed".
medit - a lightweight and fast text editor, a great alternative to gedit without alot of GNOME dependancies.
Leafpad - This is even more lightweight than medit, also GTK based. It is just a simple plain text editor, no other bells and whistles included. I've set all text files to open with this by default.
Geany - Another lightweight IDE, or if you will a text editor with code highlighting and other cool tools for programmers or anyone who needs to occassionally edit a file. I've been using kate for this, but I'm thinking about using geany instead from now on, as it has everything kate does (and more) and yet is GTK based (which is my favourite GUI).
EDIT: Forgot to mention..
Sylpheed - A great lightweight GTK email client. Much faster than anything I tried and without lack of features needed for email management.