RapGet is a downloader tool for downloading files from files hosting services like Rapidshare, Megaupload and others. RapGet supports around 68 free file sharing sites.
It has support for proxy, if you are behind a proxy you can specify the details in settings. You can also schedule your downloads using scheduler.
It is a standalone application, download the zip archive and extract it to a folder and use it. Source: DownloadSquad