Useful software Ubuntu

System Load  Indicator

This will add the CPU, RAM, Network and HDD usage meters to the taskbar so user can quickly get an idea about the system.We can see more detailed information about the system as well from the system monitor window.

Add the repository by typing the following line in terminal
sudo add-apt-repository ppa:indicator-multiload/stable-daily
To update and to install run the following two commands.
sudo apt-get update
sudo apt-get install indicator-multiload
Or you can download it from the software center.

Xfburn-CD/DVD burning tool

This is useful for creating CDs and DVDs from files on your computer or ISO images downloaded from elsewhere.You can install it from software center or run the following command in the terminal.

sudo apt-get install xfburn

KSnapshot

KSnapshot is a simple applet for taking screenshots. It is capable of capturing images of either the whole desktop, or just a single window. The images can then be saved, or passed to another application using drag and drop.

sudo apt-get install ksnapshot

http://www.ubuntugeek.com/jupiter-light-weight-power-and-hardware-control-applet.html