JDownloader is a free application written in Java for downloading files from file hosting services like RapidShare or MegaUpload. It simplifies downloading files not only for users with a premium account users of RapidShare or MegaUpload but also for free users. It offers downloading in multiple parallel streams, captcha recognition, automatic file extraction and many more other features. The new version of JDownloader is released with changes to the UI which makes it much more faster and also integrates with Firefox Add-on Flashgot.
The Firefox Extension Flashgot now supports JDownloader and is bundled together with this application. This add-on will be installed to Firefox along with the JDownloader install. JDownloader also supports themes by which you can change the look and feel of the interface.