There are so many fantastic desktop applications for linux users. Here’s a list of the top 7 that I favour the most.
Guake
This is so simple it hurts. A fold away command line anyone? Hit F12 and it’s gone. F12 again and it’s back! Keeps your terminal session persistent too.

recordMyDesktop/gtk-recordMyDesktop
While recordMyDesktop is a command line tool for capturing desktop sessions, gtk-recordMyDesktop (in the screenshot) is a front-end written in python.

BleachBit
From the website:
BleachBit deletes unnecessary files to free valuable disk space, maintain privacy, and remove junk. Rid your system of old clutter including cache, cookies, Internet history, localizations, logs, temporary files, and broken shortcuts.

HardInfo
From the website:
HardInfo can gather information about your system’s hardware and operating system, perform benchmarks, and generate printable reports either in HTML or in plain text formats.

Agave
Agave is a very simple application for the GNOME desktop that allows you to generate a variety of colour schemes from a single starting colour.

Freemind
Fantastic mind-mapping software that does so much more besides

DeVeDe
DeVeDe is a program to create video DVDs and CDs (VCD, sVCD or CVD), suitables for home players, from any number of video files, in any of the formats supported by Mplayer.

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Excellent post as usual sir. Still can’t get over how fantastic guake is, and more to the point, how I didn’t even know about it till two days ago.
Loving how you’ve left a pic of your missus on the screenshot for guake, too!
!b
Guake really is good/handy.
The simplest things are often the best
Oh and keep your hands off my wife!!
(not saying she’s simple!)