From the App Doc help in Sitellite:

AppDoc is Sitellite's built-in documentation utility. AppDoc provides a detailed introspection of any installed Sitellite app, including access settings and box/form usage examples. AppDoc integrates with PHPDocumentor (pre-installed) to generate API documentation as well, and for developing end-user documentation AppDoc features a built-in WYSIWYG multi-lingual user manual editor.

AppDoc takes PHP development to the next level by providing better transparency in your code, and by taking care of the nitty gritty details most platforms neglect to address, such as end user manuals. Help is an integral part of the Sitellite development model.

In addition to documentation, AppDoc provides translation features, which allow you to translate your Sitellite-based applications into multiple languages. This is accessible from the "Languages" link on each app's detail screen.