InterWorx is described as 'The InterWorx Hosting Control Panel is a Linux web hosting control panel offering a plethora of features for both the system administrator and website owner. The panel also offers clustering in order to be able to expand beyond what the conventional stand-alone server can offer' and is an app in the Network & Admin category. There are more than 25 alternatives to InterWorx for a variety of platforms, including Linux, Self-Hosted solutions, Online / Web-based, Windows and Mac. The best alternative is Webmin, which is both free and Open Source. Other great apps like InterWorx are cPanel (Paid), Ajenti (Free Personal, Open Source), Vepp (Free) and Froxlor (Free, Open Source).
Vepp is a simple yet powerful software for managing WordPress websites on a VPS, dedicated server, or in a cloud. It’s a convenient alternative to traditional control panels. And it's a great cost-effective alternative to pricy managed WP services.
CentOS Web Panel - Web control panel is designed for quick and easy management of (Dedicated & VPS) servers without of need to use ssh console for every little thing. There is lot's of options and features for server management in this control panel.
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.
DirectAdmin is the easiest to use control panel. DirectAdmin is programmed to be the fastest running control panel available. DirectAdmin avoids downtime by automatically recovering from crashes. We offer lightning-fast support by phone, e-mail, forum, and live online chat.