In November 1998, the Qt toolkit was licensed under the free/open source Q Public License (QPL) but debate continued about compatibility with the GNU General Public License (GPL). In September 2000, Trolltech made the Unix version of the Qt libraries available under the GPL, in addition to the QPL, which has eliminated the concerns of the Free Software Foundation. KDE has since been split into KDE Plasma Workspaces, a desktop environment, and KDE Software Compilation, a much broader set of software that includes the desktop environment.