ISPConfig3 is a web services control panel available from https://www.ispconfig.org, heavily documented at https://www.howtoforge.com/.

It is true open source, but a subscription is well worth your while since subscribed users get priority support from the excellent support team. Also, as with any open source project, a subscription/recurring donation allows the developers to spend time improving the product over the years.

The ISPConfig project began in 2005 by Till Brehm (still active in the project) and works with most Linux operating systems, managing Apache/nginx, MariaDB/mySQL, Postfix, Dovecot, Bind/Powerdns and much more.