What are some alternatives?
When comparing ISPConfig and cPanel, you can also consider the following products
Webmin - Webmin, Usermin, Virtualmin, Cloudmin, Linux, System Administration
Plesk - Plesk puts all the automation, security, and technical tools an IT professional needs in one simple and easy to use dashboard.
Ajenti - Web administration panel for servers and custom hardware
DigitalOcean - Simplifying cloud hosting. Deploy an SSD cloud server in 55 seconds.
Vesta Control Panel - – What I love about Vesta is that it's fast and easy to use
Hostwinds - Hostwinds offers web hosting services and solutions.