OfflineInspired 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. 
Cheers
Danijel
scrot - simple functional screenshot tool. Command-line based, supports grabbing the whole desktop or only a window, with or without border, to different image file types. Best combined with sleep
xfce4-iconbox - very "taskbar replacement" showing only icons, with colour support for minimized windows and other workspaces. Xfce 4.4 beta only includes it in crippled form. To get it in xfce4.2, start it manually and save session.
until I think of sonething else
Thomas Jollans
GnuPG key: 1024D/A6B5 9461 B60F 2C80 2399 6B1E 2698 A70E F421 434B
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nedit Easy to use yet powerful editor. Development started in the early 90s, so it's rock solid and well tweaked now. It uses the motif/lesstif GUI, so it's not exactly pretty, but who cares it's for getting work done not for gawking at.
kdissert Mind mapping and document writing tool. Can export to many document formats including LaTeX and LaTeX presentations.
CAN I HAS FIXD CAPSLOK KEE PLZ?
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mpd - The music player daemon.
transmission - A lightweight bittorrent client.
epdfview - A lightweight PDF document viewer.
htop - An interactive process viewer that is a great replacement for top
feh - A lightweight and fast image viewer.
freetalk - A nice console based Jabber client.
gajim - A great Jabber client written in PyGTK
Linuxinfusion.com - A GNU/Linux and FOSS blog.
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Here are some more
gtk-chtheme - allows you to change gtk themes, especially useful if you're using a lightweight window manager which doesn't have an equivalent tool.
Nitrogen - an alternative desktop wallpaper changer, again useful on light WMs
adesklets - small, fast and efficient desklets system (alternative to superkaramba and gdesklets)
Let's not fear freedom.
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mpd - The music player daemon.
I'll have to counter that buddy
xmms2 - a completely new music player my the xmms team+more with modern features and high UI independance
XMMS2tray - X11 systray/notifications integration for xmms2. written by yours truly.
Thomas Jollans
GnuPG key: 1024D/A6B5 9461 B60F 2C80 2399 6B1E 2698 A70E F421 434B
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Well, the following application might not be useful for everybody, but for sure they're pretty exotic.
XEphem
Celestia
Stellarium
For Stellarium 3D-acceleration helps a lot, but it's not necessary. For Celestia you'll need it if you don't want to have a slide-show.
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fish (friendly interactive shell) - looks cool. It's not bourne shell compatible, but it's probably brilliant for people who aren't particularly used to bourne
some syntax highlighting, especially commands are green if they exist and red otherwise. sweet
used Celestia... quite cool...
Thomas Jollans
GnuPG key: 1024D/A6B5 9461 B60F 2C80 2399 6B1E 2698 A70E F421 434B
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I tried fish and it's my default shell now. I bet after a while it will be painful to use bash again.
CAN I HAS FIXD CAPSLOK KEE PLZ?
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enlightenment - 'E17' is a great lightweight WM. Currently in development, this WM is showing alot of prommise. Grab a copy out of CVS and see.
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