Encode Explorer is an easy-to-use php script to use as an index file. It shows files in the server and lets you browse through folders, upload files etc. It is kept small and neat so that the source can be used for learning.
WebShare project (Ajax/PHP), the user-friendly webFTP explorer. It can handle Web documents as easily as the were on your own computer. Like a classic explorer, you can view, copy, edit or save, but you can access and share it from anywhere!