GWTUpload <http://code.google.com/p/gwtupload/> is a library for uploading files to web servers, showing a progress bar with real information about the process (file size, bytes transferred, etc). It uses AJAX requests to ask the web server for the upload progress. It has two components written in java, the server side with servlet and utility classes, and the gwt client side.
JsUpload is the client library but compiled and exported into javascript, so users that don't develop in java can use it directly in web pages. It provides a server program written in perl which can be installed in any web server as a cgi-bin script.
