Usermin is the open-source end-user interface from the Webmin team, served on port 20000, managing email, files, and passwords without IMAP/POP3, with low resource usage for lightweight self-service panels.
ServerPilot is a US-based PHP server management platform that lets you manage servers at any cloud provider, including DigitalOcean, Linode, Vultr, AWS, and Google Cloud, with automatic security updates, free SSL, and resource monitoring starting at $5/server per month.
Kloxo is a free, open-source (AGPL v3) hosting control panel, formerly Lxadmin, installing on RHEL 8/9-family systems with about 130 one-click apps and switchable Apache/lighttpd and BIND/djbdns stacks, suited to budget virtual hosting.
KeyHelp is an open-source server control panel developed by German hosting provider Keyweb AG, free in the base version and EUR 9/month for Pro, supporting Ubuntu/Debian, 15+ languages and unlimited domains as a low-cost cPanel/Plesk alternative.
ISPmanager is the Linux server management panel by Russia's ISPsystem, providing integrated website, email, DNS, database, SSL, firewall, and billing management via a web interface, simplifying shared hosting and server management for hosting providers and enterprise IT.
InterWorx is a US-developed commercial server control panel offering the NodeWorx admin and SiteWorx user interfaces, with PHP 5.6 to 8.2 support, Nginx/Apache dual engines and free Let's Encrypt SSL. Lightweight and high-performance, it suits cost-conscious small hosters.
AA Panel (aapanel.com) is a free server management panel from China that helps administrators easily manage servers, websites, and applications through a web interface, with integrated website, database, email, FTP, and SSL management.
CyberPanel is a free open-source hosting control panel built for OpenLiteSpeed, deployed on 500,000+ servers, with WordPress Manager, AutoSSL, and Docker management as a high-performance open alternative to cPanel.
Plesk is a leading website and server management platform founded in Prague, Czech Republic in 1999, one of the few hosting control panels supporting both Windows and Linux, with built-in WordPress Toolkit, Docker/Git integration, and security extensions for hosting providers and enterprises needing Windows hosting, multi-language interfaces, and developer tools.
DirectAdmin is a lightweight commercial hosting control panel launched by US-based JBMC Software in 2003, running on 512MB RAM with unlimited-domain licensing from $29/month, the most cost-effective cPanel alternative.
cPanel is the world's most widely used website hosting control panel and the de facto standard for Linux shared hosting, providing WHM multi-server management, AutoSSL free certificates, and 400+ one-click application installs for hosting providers, resellers, and site owners.
ZPanel is a UK-origin open-source virtual hosting control panel that once delivered integrated hosting management on Windows and Linux, but the project is now discontinued and suitable only for study and legacy environments.