LXQt is a lightweight Qt-based desktop environment for X11 derived from LXDE and Razor-qt. It provides a session manager, a file manager (also desktop manager) PCManFM, OpenBox as default window manager, desktop panel, lxImage viewer, qTerminal, obConf, Oxygen icons, and more.
NeXTSTEP-like window manager for X Written by Alfredo Kojima almost from scratch, resembles the NeXTStep look very closely, and it is now an official GNU project. Window Maker (originally named WindowMaker) is not overloaded with features, and it is easier to configure than most other window managers. Its final goal is to produce a window manager that doesn't require editing of configuration files. Window Maker is fast and doesn't require tons of memory to run.
GNOME is a desktop environemnt and an application collection for BSD/Linux systems. It aims for accessibility and simplified interfaces. It utilizes the Gtk+/Gdk/Glib, Cairo/Clutter, WebKitGtk and GStreamer toolkits, Mutter as its window manager, also strongly integrates DBUS and Avahi, provides an adaptable Gnome shell, many productivity and system applications,and some games.
Xfce is a desktop environment for X11 and Unix-like systems. It's comparatively lightweight and low on system resources, yet provides a modern and customizable interface. It includes a window manager, a panel and taskbar, file management, system and desktop setting tools, power management, intuitive virtual desktop switching, and a media player amongst other features.
Wmconfig is a text-based menu generation tool for various X window managers for desktops. Toolkits like Qt or Gtk are not required. It uses a simple configuration layout and the configuration may be edited with a text editor.