The best free alternative to Plesk is Webmin, which is also Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Plesk and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Plesk are 1Panel, Cloudron, Ajenti and HestiaCP.
Web-based admin interface for Unix-like and Windows systems provides modules for user, service, and network configuration, open source application management, security, backups, monitoring, automation, remote access, and firewall controls.
You have to get Virtualmin to get several "normal" functions. And the Pro Version costs!!
Open-source interface for efficient Linux server management, featuring host monitoring, file management, and database control. Streamlines WordPress deployment with domain and SSL setup. Offers app store, security features, backup, and restore.
Cloudron is a complete solution for managing apps & users on your own server. Easily deploy production ready apps from the app library and keep them automatically up-to-date. It even comes with a built-in email server and web clients!.
Only the free version is open source! The Pro costs!
Ajenti is a Linux & BSD modular server admin panel. Ajenti 2 provides a new interface and a better architecture, developed with Python3 and AngularJS.
Be careful!!
"Big Brother" from the FSB may be watching you!! ((
Easy to setup and a modern looking interface.
Hestia Control Panel is an open source web server control panel with an easy-to-use interface as a lightweight alternative to cPanel, Plesk, etc. Hestia It's also the continuation of the development of Vesta Control Panel.
ISPConfig 3 is an open source hosting control panel for Linux. ISPconfig 3 is capable of managing multiple servers from one control panel. ISPConfig is licensed under BSD license.
Simple Hosting Control Panel
Vesta is an open source Hosting Control Panel that is free to use under GPLv3. It provides an easy to use control panel that allows the management of websites, DNS, mail, backups, and more!.
complicated controll of domains
The most simple, powerful and beautiful host management panel, an open source alternative to OpenResty Edge, allows you to easily secure reverse proxy websites running at home or on the Internet, including access control, denial of service attack protection, automatic...
UCS is an open platform for central identity & access management, IT management, and active directory, with a web portal for easy access to applications.
CyberPanel is web hosting control panel which is based on OpenLiteSpeed. Comes with builtin support for DNS, FTP, email, file manager and automatic SSL.
Virtualmin is a powerful and flexible web hosting control panel for Linux and BSD systems. Available in an open-source community-supported version, and a more feature-filled version with premium support, Virtualmin is the cost-effective and comprehensive solution to virtual web...
Sentora is an open-source web hosting control panel built specifically to work on a variety of Linux distributions. Sentora is licensed under the GPL and is a separately maintained fork of the original ZPanel project.
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Virtualmin from the same developer (also listed here) is much closer alternative to Plesk.