KDE Software Compilation 4
>
KDE Software Compilation 4 was the only series of the so-called KDE Software Compilation, first released in January 2008 and the last release being 4.14.3 released in November 2014. It was the follow-up to K Desktop Environment 3. Wikipedia
Initial release date: January 11, 2008
Final release: 4.14.38 (November 7, 2017; 6 years ago)
License: GPL, LGPL, BSD license, MIT license and X11 license