Conky: lightweight system monitor

Conky is a free software to monitor your system. It is licensed under GPL General Public License. The current stable release is 1.7.1.1. Conky is very customizable and monitors your CPU, memory, disk space, processes, system messages, battery power, temprature and many others. It is a lightweight program and will not take a lot of resources to run. Conky can display your system processes just by using plain text or different colours and fonts. To learn more about the program go to their site where you can also see some screenshots. Conky website.