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PHP Doc System is a modular PHP document creating system. Instead of having to copy/paste information you'd want to have in 2 or more places, You can create modules for documentation elements (installation steps, buttons, screens, etc.) .

phpdocumentor is the current standard and complete PHP document management solution, which can be used from the command line or a web interface to create professional documentation from PHP source code.

PHPDOCX do this and much more. You may create highly customized reports in Word extracting data directly from any database or spreadsheet. These reports may include editable graphs, images, tables, headers, footers, etcetera.

PHPfileNavigator v2.3.3 is state-of-the-art, open source web based application to complete manage your files and folders.

eZimDMS is a full-featured web-based PHP Document Management System (DMS). You can store any type of file in eZimDMS, and the most common types of files have the ability to be indexed, and therefore become searchable.

PHPExcel - OpenXML, is designed to create Excel2007 documents in PHP, it is also a Spreadsheet engine. This Project PHPExcel provides a set of classes for the PHP programming language, which allow you to write to and read from different file formats.

infoRouter is an Electronic Document Management Software that includes Digital Asset Management, Document Imaging, Document Scanning, Workflow, Records Management, Document Archiving, Document Storage.

PHPExplorer, a file explorer with powerful options and a website manager, all-in-PHP.
phpExplorer can (un)zip (on-the-fly) directories or files, read and modify, print or display text and pictures and all the standard files function .

eXtplorer is a web-based File Manager. You can use it to
browse directories & files on the server and
edit, copy, move, delete files,
search, upload and download files,
create and extract archives.