jClientUpload  

jClientUpload is a client-side JAVA™ component (Applet) that allows to upload files to a web server. This component could be integrated in any application. Server-side technology could be JSP/Servlet, PHP or Microsoft ASP. Front-end provides an upload progress bar, a cancel button and drag&drop support. jClientUpload is customizable : colors, size and multilanguage support.

Price: $19/$199

   JFS  

JFS is a simple, TCP/IP based network filesystem protocol. It allows applets running in a web browser to load and save files on a remote server, as well as send email and print documents through the JFS server. Because Java applets cannot access the filesystem of the machine they are running on, this provides a useful way for applets to store state information. Free for non-commercial use!

Hosting Requirements: Unix
Price: Free