All of our current shared hosting plans use a bespoke pem control panel provided by Parallels.
On our pre-October_2008 hosting plans we used Helm on windows, while on linux our main control panel is Direct Admin
Our legacy VPS plans come with the virtuozzo control panel for general server functions, with the option to purchase the Plesk control panel if you wish when buying the VPS.
Our newer Virtual Machine\VM plans have the OnApp control panel for general server functions and you can install any web hosting control panel that you wish, though some templates do come with Plesk pre-installed.
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