Ajenti is an open source, web-based control panel that can be used for a large variety of server management tasks. It can install packages and run commands, and you can view basic server information such as RAM in use, free disk space, etc. All this can be accessed from a web browser.
Optionally, an add-on package called Ajenti V allows you to manage multiple websites from the same control panel and easily configure email accounts for your domains.
Tutorials in series
Tutorial
How To Install the Ajenti Control Panel and Ajenti V on Ubuntu 14.04
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