KaufKauf Slim Linux is a fully configured Linux-based operating system that is able to run from flash memory. It doesn't require more than 700 MBytes of disk space. It comes with full support for several touch controllers and is made to run on weak systems (400 MHz CPU and 256 MBytes RAM are enough). It is designed for embedded systems, doesn't need to be shut down cleanly and comes with Xfce, CUPS, and several other features.
Wimpiggy is a library for writing EWMH-compliant, compositing window managers using Python and GTK+. The goal is to make writing a window manager as easy as writing a PyGTK application. This library can be used to build a trivial, working window manager in only about 40 lines of code.
Musca is a simple window manager for X allowing both tiling and stacking modes. It is similar to ratpoison but more friendly to the mouse and using a simpler keyboard navigation. There are no built in status bars, panels, or window decorations save for thin window borders to indicate focus. Window navigation can be mouse click to focus or entirely keyboard driven. Window tiling is manual but simple, and there are no restrictions on how you divide up the screen. It uses dwm's dmenu utility for launching apps and running various built in commands not mapped to hot keys.
libAfterImage is an image import, storage, manipulation, and output library for X. It features support for antialiased, TrueTypei, and X text, a 128-bit internal graphics engine, in-memory RLE image compression, high quality image scaling/flipping/blending, multipoint linear gradients, superior quality image output on X drawables, and much more.
Perl OS is a program that provides an easy interface to run Perl/Tk programs. It was also created to be an easy working environment, complete with a text editor, paint program, and more. It comes with several programs, along with a utility to add many more which can be found on the Internet. From the outside, Perl OS looks like a simple operating system. But inside, it is a powerful system for working with Perl and Tk.
Lobotomy involves many sub-projects oriented to experimentation about new design for human-computer interaction and, more generally, a new way for home computing. It involves a relational filesystem, a window manager, and many libraries, tools, and daemons to automatically extract and handle metadata.