Jackhammer - Version 2.1 Next time you hit roadworks on the information superhighway, Jackhammer will help you dig yourself out of the hole. Whenever you find a site that's too busy to get on to, or an FTP server that's always full, paste the URL into Jackhammer. Set it hammering and it will try the sites until it can get on - and then launch a new browser window for you or automatically download the file!