Quack is a package for Emacs by neil-van-dyke that enhances Emacs support for Scheme. It is layered atop the standard packages cmuscheme.el, by Olin Shivers, and scheme.el, by Bill Rozas and Dave Love.
Quack is available online at http://www.neilvandyke.org/quack/, though some GNU/Linux distributions include it as well.
apt-get install emacs-goodies-el
emerge app-emacs/quack
As of March 2, 2009, quack is set to be included in emacs-goodies-el in Debian. quack-el, the previous package, was removed from the archive in January of 2008. All of the autoloads do not work perfectly, so you should still add (require 'quack) to your ~/.emacs.
As of late July 2018, quack has been dropped from emacs-goodies. From the emacs-goodies README: "D quack.el provides enhanced support for editing and running Scheme code in..." and "In the following list, a prefix of "D" means "dropped", "E" means...". Quack is not listed at elpa.gnu.org or stable.melpa.org.
Please add other distributions.
cd /usr/share/emacs/site-lisp wget http://www.neilvandyke.org/quack/quack.el echo "(require 'quack)" >> ~/.emacs
category-software category-implementations