JDownloader is a download manager, written in Java, which allows automatic download of groups of files from one-click hosting sites. JDownloader supports the use of premium accounts. Some parts, but not all, of JDownloader are open source. In December 2009 the program's website was in the top 1000 visited websites of Spain. The German online magazine, Chip.de designated it "newcomer of the year" in 2009, after it ranked among the top 50 most downloaded applications, with over half a million downloads in a year.