phpXplorer is an file management system and explorer that makes it possible to work on a remote file system through a Web browser. By default, it includes dialogs for editing HTML, PHP, images, Apache, compressed files, and emails. Its modular design makes it easy to build your own filetypes, property sheets, views, and themes. A permission manager allows you to restrict access to the shared file system for multiple users in a detailed way.
FSGuide is a Norton Commander clone used by many hosting firms and individuals for advanced file management through the Web. It features user management (password protection, and access control), advanced file selection dialogs, a multiple file uploader (which can also run any application after uploading), a text viewer, a binary file viewer, a source highlighting viewer, an internal text and binary editor, language support, and much more.