Webmin!

Web-based Linux server administration panel.Works best for VPS and dedicated servers.Runs on Debian, Ubuntu, RHEL and CentOS.

ISPmanager is one of the leading web server control panels on the market. The control panel allows you to manage your entire web-server through a user friendly and comprehensive multi-language web interface. With the click of a mouse you can manage users, hosting packages, mail boxes, databases and much more from one centralized location in a simple and intuitive way.

The cPanel and WHM software package makes life easier for web hosts and the website owners they serve. It offers easy-to-use, powerful tools that perform essential tasks quickly, easily, and reliably.

Vesta Control Panel is an open source web hosting control panel with premium features, minimalistic, safe and light

Cloudron is a platform that makes it easy to run and maintain web apps on your server. Unlike 1-click solutions that do not assist you with any tasks post installation and require knowledge of system administration (like installing certificates, creating databases, having a backup/restore strategy), Cloudron provides a complete integrated solution for app and user management.

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.

ServerPilot makes it easy to host WordPress and any other PHP sites on DigitalOcean, Linode, Rackspace, Vultr, and other cloud providers. By turning any server into an optimized PHP and WordPress hosting platform, ServerPilot makes it simple to run your sites in the best way possible: on cloud servers.

Access your computer from any web browser when you need it, securely, with Ulterius.

Cockpit makes it easy to administer your GNU/Linux servers via a web browser.

Internet Multi Server Control Panel (i-MSCP) is a project founded to build an impressive and powerful opensource Multi Server Control panel for personal and professional usage. It must allow to manage any shared hosting environment in an easy way without any human intervention on the servers file system.

Atomia DNS is a free, open source DNS management system. It is easy to use, reliable, scalable and production ready.

AlternC is a set of software management on Linux shared hosting, easy to use, easy to install, based solely on software Opensource AlternC being under the GPL .

ZPanel is a free and complete web hosting control panel for Microsoft Windows and POSIX (Linux, UNIX and MacOSX) based servers. ZPanel is written in PHP and uses several open-source (or freely available) software packages to provide a secure, web hosting system. Learn more...

VHFFS is a massive virtual hosting platform for free software.

Ehcp is a Hosting Control Panel (hcp).hcp is a tool in a server to facilate the process of hosting domains, emails, adding domains, ftp users and so on.