ISPConfig is an open source hosting control panel for Linux.
ISPconfig 3 is capable of managing multiple servers from one control panel.
Managed Services and Features
*Manage one or more Servers from one Controlpanel (Multiserver Management)
*Different permission levels (Administrators
... [More], Resellers and Clients) + Email user level provided by a roundcube plugin for ISPConfig
*Httpd (virtual hosts, domain and IP based)
*FTP, SFTP, SCP
*DNS (A, CNAME, MX, SRV and TXT Records)
*Server based mail filtering
*Advanced email spamfilter and antivirus filter
*Traffic limits and statistics
*Jailed shell access