Stacer: Linux System Optimizer and Monitoring
github.com
github.com
I will admit that I started managing Linux through GUIs, but ultimately CLI utilities and configuration files lead to a deeper understanding and a wider set of options.
Run Arch Linux for a few months and you'll get over the textual interface hump.
I mean those desktop widgets displaying CPU/Mem usage integrate much better into the desktop. If you want to uninstall something you should better know what you are doing and the same goes for init jobs...
Don't get me wrong I love visual tools as long as they do something better than their cli equivalents. For example, I am a huge fan of filelight https://en.wikipedia.org/wiki/Filelight because it enables quick insights about disk usage.