Multiple File Upload Plugin: jQuery File Upload

jQuery File Upload is an open source extensible jQuery plugin that supports multiple file upload with lots of useful features including drag and drop, upload progress indicator and cross-site file uploads.

jQuery File Upload implementation is based on open standards like HTML5 and JavaScript and requires no additional browser plugins. This plugin uploads files via XMLHttpRequests (if supported) and uses iframes as fallback for legacy browsers.

It is compatible with any server-side application platform and works well with Google App Engine (Python, Java), Ruby on Rails, PHP and any other platform that supports HTTP file.