Webmin is a mature, stable, free, and Open Source Linux administration panel.
It is, by a wide margin, the most popular Linux control panel.
In addition to it's rich features, Webmin can coexist with virtually any software.
Install Webmin on CentOS
Install Webmin on Debian
Install Webmin on Fedora
Install Webmin on Scientific Linux
Install Webmin on Ubuntu
You can also install Webmin as well as grab the GeoHelm module using our Quick Start Scripts
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If you prefer full visuals, we made a video you can watch here: