KDE

KDE is an international free software community producing an integrated set of cross-platform applications designed to run on Linux, FreeBSD, Solaris, Microsoft Windows, and OS X systems. It is known for its Plasma Desktop, a desktop environment provided as the default working environment on many Linux distributions, such as openSUSE, Mageia and Kubuntu and is the default desktop environment on PC-BSD, a BSD operating system.

Quotes

 * I personally just encourage people to switch to KDE. This "users are idiots, and are confused by functionality" mentality of Gnome is a disease. If you think your users are idiots, only idiots will use it. I don't use Gnome, because in striving to be simple, it has long since reached the point where it simply doesn't do what I need it to do.  Please, just tell people to use KDE.


 * This is KDE and it is all I use, personally. […] I am completely on board with this, I find myself more productive under Linux than I've ever been […]. This is an operating system made by programmers for programmers, so… How can you not want to explore this space?
 * Rich Geldreich