Arm0nia Project
- Group of projects intended to make Unix more powerful and friendly by creating a desktop environment based on plugins.
- http://arm0nia.org/

EDE - Equinox Desktop Environment
- Main goals of this project are simplicity, speed, minimal memory usage (if possible), good look and fell and stability. That does not mean it will be for 8086. It's FLTK-based.
- http://ede.sourceforge.net/

XPde
- A desktop environment(XPde) and a window manager(XPwm) for Linux. It tries to make easier for Windows XP users to use a Linux box. Nothing more, no clipboard compatibility between Gtk and Qt applications, no emulation of Windows applications, no unificati
- http://www.xpde.com/

DesktopX
- Extends Windows desktop to support true objects (can be anything) instead of passive icons, use one by one, or mix together to form themes; build your own desktop interface, even if not a programmer. [Stardock Corporation, Inc.]
- http://www.stardock.com/products/desktopx/

GPE: The GPE Palmtop Environment
- Project for a Free Software GUI environment for palmtop-handheld computers running GNU/Linux operating systems.
- http://gpe.handhelds.org/

GUIdebook
- A website dedicated to preserving and showcasing as many Graphical User Interfaces as possible. Lots of screenshots and icons.
- http://www.aci.com.pl/mwichary/guidebook

The Definitive Desktop Environment Comparison
- Compares UI and usability of several desktop environments (DEs) that are widely used, admired, reviled: Windows XP Luna, BeOS 6 (Dano/Zeta), Mac OS X Aqua, Unix KDE and GNOME. Large article with many forum comments. [OSNews.com]
- http://osnews.com/story.php?news_id=3064

The GUI Gallery
- Surprisingly large and thorough Graphical User Interface list, with timeline, screenshots, downloads, links. Very useful resource for students of computer interfaces.
- http://toastytech.com/guis/

Xfce Desktop Environment
- Runs on FreeBSD, Linux, SunOS/Solaris; English, French, German. Description, downloads, CVS, screenshots, bug reports, fora. [Open Source, GPL; SourceForge.net]
- http://sourceforge.net/projects/xfce/

Hooray for Bluecurve
- Article praises, analyses Red Hat's new user interface in their Linux 8.0. [Linux Review]
- http://www.linuxjournal.com/article.php?sid=6476

Alternative Linux Desktop Environment
- Provides C++/Java application framework.
- http://sourceforge.net/projects/alde/

XFce
- Lightweight desktop environment for various Unix systems, easy to use and configure, fast, XFce 3 is based on GTK+. Description, downloads, screenshots, links, credits. [Open Source, GPL]
- http://www.xfce.org/

foXdesktop
- Lightweight desktop environment, uses Fox multiplatform C++ widget set. [Open Source, LGPL]
- http://foxdesktop.sourceforge.net/