To maintain your server easily you must need a control panel. We have all popular control panel license available here at rainhost. You can buy these while ordering your servers. If you not did so you can buy later as addon products. Below is the price table for cPanel, Plesk and DirectAdmin control Panel. Beside that you can also get free Kloxo MR and Vesta control pnael.
cPanel: $16/mo for VPS | $40/mo for Dedicated Server
Plesk 10 Domains: $8/mo for VPS | $17/mo for Dedicated Server
Plesk 100 Domains: $10/mo for VPS | $40/mo for Dedicated Server
Plesk Unlimited Domains: $15/mo for VPS | $55/mo for Dedicated Server
DirectAdmin: $12/mo for VPS | $40/mo for Dedicated Server