ISPConfig - Hosting Control Panel
Nightly (master): 
Stable branch: 
- Manage multiple servers from one control panel
- Web server management (Apache2 and nginx)
- Mail server management (with virtual mail users)
- DNS server management (BIND and MyDNS)
- Virtualization (OpenVZ)
- Administrator, reseller and client login
- Configuration mirroring and clusters
- Open Source software (BSD license)