You may copy, distribute and modify the software as long as you track changes/dates in source files. Any modifications to or software including (via compiler) GPL-licensed code must also be made available under the GPL along with build & install instructions (source tldrlegal.com).
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Menu Builder allows you to easily create custom menus/navigation lists in the ProcessWire Admin using drag and drop. If you especially want to create menus that do not mirror your site's page tree and/or like to build menus visually then this module is for you. The module is packed with lots of features to structure and style your menus to suit any project, big or small. In the backend, ProcessMenuBuilder ensures that you have fine-grained control over each and every menu item. Combined with a powerful frontend API (MarkupMenuBuilder), you can take advantage of a number of runtime options to build your navigation lists exactly how you want.
Full documentation on how to use Menu Builder can be found here and the support forum here.
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