TaskJuggler is GPL-licensed (free software) project management software that runs under the Linux and Unix operating systems and is programmed in C++ using the Qt toolkit and KDE libraries. The TaskJuggler Project was started in 2001 by Chris Schläger. Early releases provided a command line tool that generated HTML reports. From August 2005 to July 2010, the package also provided a graphical user interface based on the KDE libraries.