Due to the popularity of cPanel, many products have been created that add new features to WHM or cPanel. cPanel Inc. has taken steps to make it easier for third parties to add features to WHM and cPanel in an organized way.
cPanel Inc. offers several of its own add-on features (typically to allow users to test new features before they are added to WHM or cPanel, or to allow access to certain optional features). However, many third parties can use the same mechanisms to add their own features to WHM and cPanel.
To install or remove one of cPanel's own add-on modules, click on Addon Modules in the cPanel section of WHM.
To install one or more of the listed modules (which are all free at the moment), select the Install and keep updated checkbox under the item description, and click Save to have WHM install the selected modules. Later, if you want to remove a module, click the uninstall module button under the module...