Kloxo is a server control panel, easy on resources and easy to use.
You can install Kloxo on Centos 5.x and RHEL 5.
The host must have 256 mb of ram and more than 2 gb free space.
Installation is quite simple.
1. Install OS (Centos or RHEL)
2. Disable SElinux and reboot (for the settings to take effect)
3. Get and run the setup script. This step could take a while.
Detailed description here