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Open Source File Manager Built with jQuery and PHP : SFBrowser
SFBrowser is an open source file manager (browser and uploader) built with jQuery and PHP for managaing files with an Ajaxed interface. It returns a list of objects with containing the names and additional information of the selected files. You can use it, like any open-file-dialog, to select one or more files.

Lightweight HTML5 Uploader for jQuery
jQuery HTML5 Uploader is a lightweight jQuery plugin that lets you to quickly add an upload system a-la-Gmail into your web app.

Ajax Upload – A File Upload Script with Progress Bar,Drag n Drop
Ajax Upload is file uploader that uses XHR for uploading multiple files with progress-bar in FF3.6+, Safari4+, Chrome and falls back to hidden iframe based upload in other browsers, providing good user experience everywhere.