KCFinder!

Pydio is the mature alternative to Dropbox and Box.com, to build your own box, on your own servers.

This is a multi talent file manager for admins and onsite-development.

net2ftp is a web based FTP client. It is mainly aimed at managing websites using a browser. Edit code, upload/download files, copy/move/delete directories recursively, rename files and directories -- without installing any software.

FileVista turns your web site into a web file server in few minutes and lets you share files with your clients or staff using any browser or device.

BytesFall Explorer (bfExplorer for short) is a web-based file manager written in PHP and JavaScript and licensed under the GNU GPL. It allows you to upload, download, view, edit, copy, move/rename, compress and change permissions of a single file/directory or a group of files/directories. It's also possible to create files and directories and execute shell commands. An SQL engine is used to store the users for the authentication (currently MySQL and PostgreSQL are supported). BytesFall Explorer has an interface similar to Windows Explorer. »

Monsta FTP is a lightweight web-based file manager you can install on your server to manage your files through any browser.

Free web file and image browser for CKEditor and TinyMCE. Free open source file manager.

Integrate a file manager into your ASP.NET application or site rapidly.

FileManager for CKEditor

QuiXplorer is a multi-user, web-based file-manager.It allows you to manage and/or share files over the internet, or an intranet.

RESPONSIVE FileManager is a free open-source filemanager image manager stand-alone and plugin for TinyMCE 4. It's possible to select files, images and videos from a server folder and upload them from your computer.

CKFinder is a powerful and easy to use Ajax file manager for web browsers. Its simple interface makes it intuitive and quick to learn for all kinds of users, from advanced professionals to Internet beginners.