The Scheme Constraints Window Manager v0.99.2 was released late Tuesday
afternoon, 14-September-1999, at http://scwm.mit.edu.  Scwm is a free X11
window manager developed using GNU/Linux for it and other Unix-like
platforms.  The 0.99.2 release is the first release from the authors,
Greg J. Badros and Maciej Stachowiak, since January 1999, and
improvements abound!

Scwm uses GNU Guile Scheme as its configuration and scripting language.
This makes Scwm incredibly programmable---truly the Emacs of Window
Managers.

In addition to the fantastic (Turing-complete!) extension language, Scwm
provides nearly all the features of all other window managers combined.
Included in this impressive list are Gnome-compliance, KDE compliance,
per-window decoration themes, incredibly configurable window behaviour,
extensible GUI configuration (via embedded GTk+) of user parameters,
highly-integrated and complete reference documentation, an Emacs
scwm-mode for interactive configuration and programming, window
movement/resizing/shading animations, an XTest extension that permits
scripting interactions with applications, an interface to esound,
integration with fvwm2 modules, a Corba server for accessing WM
functionality from other applications, access to libproplist databases,
and much more!

Most notable in Scwm is its constraint solver to permit sophisticated
desires regarding window layout to be specified interactively, then
maintained by the window manager.  Scwm embeds Cassowary, a constraint
solver developed at the University of Washington by Badros and his
advisor, long-time constraints researcher Dr. Alan Borning.  Cassowary
enables Scwm to maintain arbitrary linear constraint relationships among
the windows.  For example, it can keep an Emacs window and an XTerm
window tiled along the left edge of the screen, can ensure a block of
windows move around together, can keep a mail window always on top of a
news reading window, and much more.  The possibilities are endless, and
an abstraction capability allows the end user to define new kinds of
constraint relationships and add them with a few simple mouse clicks.

This release of Scwm demonstrates how much extra productivity is
possible when there are no limits to how windows can be arranged and
manipulated.  See http://scwm.mit.edu/scwm/ for more information about
Scwm, and http://www.cs.washington.edu/research/constraints/cassowary/
for more information about the Cassowary constraint solver.