Create Android or iOS app that uses local documents

I.B.C. App Maker plugin Document

The Document plugin allows the creation of apps with hypertext content without having to access the web using the URL plugin. In addition to avoiding access to the web, this plugin is particularly fast in loading data that resides directly on the device. It is recommended for all those contents that are updated frequently. The document must be created with the internal text editor which handles a format similar to .rtf, with support for fonts, formatting, alignment, images, links and much more. 

This plugin is free.