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scons-chicken is an add-on for SCons, a building
system (much like make and autotools all in one),
that adds support for Chicken, a Scheme-to-C compiler.

Astwar is a ncurses based simple space shooter;
two little ships (asterisks), each on one side of
the screen, try to shoot each other. There is
network support with several multiplayer options
and user extension with Scheme (via Guile) to
program the little ship to do some things
automatically are in the works.

MIT Photonic Bands (MPB) is a free program to compute the band structures (dispersion relations) and electromagnetic modes of periodic dielectric structures, and is applicable to photonic crystals (photonic band-gap materials), optical waveguides, and a wide range of other optical problems. Its features include: fully-vectorial 3D computations, a flexible user interface based upon the GNU Guile scripting language, output in HDF format, and iterative, targeted eigensolver methods to address very large problems by solving for only a few states near a specified frequency. It runs on both serial machines and parallel machines with MPI.

SCRIBE is a text processor. Even if it is a general purpose tool, it best suits the writing of technical documents such as web pages or technical reports, API documentations, etc. At first glance, it looks like a mark-up language a la HTML, so there is no need for computer programming skills to use it. A second look reveals that it is actually a true programming language, based on Scheme, provided with high-level features (such as objects, higher order functions, regular and syntactic parsing, etc.).

guile-alsaplayer is a set of guile bindings for
libalsaplayer.

sr-convert is a sample-rate conversion utility for
WAV files. It supports a wide variety of sampling
rates and can convert from any of the supported
rates to any other. It runs under either x86 Linux
or Windows and uses SSE instructions if they are
available. Great pains have been taken to make
sure that the sound quality of the conversion is
excellent.

Kipt (Kizome's ISA Piercing Tool) is an HTTP proxy
server and proxying name server with the ability
to forward requests to other HTTP proxies or to
get the documents directly from hosts. It can go
through MS ISA Server or MS Proxy doing NTLM
authentication. If you're stuck behind a
restrictive firewall or proxy with at least one
port open for outgoing connections and you have
access to a machine outside, you can have nearly
full Internet access by using this proxy and the
socksify program from dante.

dfsch is Scheme-like LISP dialect. It draws inspiration from R5RS, but also contains concepts inspired by other languages, mainly Common Lisp, most notable of which is inclusion of a CLOS-style object system with multiple dispatch and condition systems. The implementation is written in plain C with a Boehm-Demers-Weiser conservative garbage collector using some object-oriented concepts on top of plain C.

scbib is a bibliography manager written in Scheme.
It handles bibliographic data written in simple
S-expressions and generates a bibtex file and an
HTML file from the S-expressions file. It is
capable of obtaining bibliographic data using the
Amazon Web service. A simple converter for
importing a bibtex file is also included.

Gleam is a simple Scheme language interpreter
written in Java. Its goals are to support the
discovery of Scheme for beginners, simplicity,
R5RS compliance, and full integration with the
Java platform (with the ability to call Java code
from Scheme and vice versa).

SchemeWay is a set of Eclipse plugins for the
Scheme programming language. It features a
powerful, fully extensible S-expression-based
editor. It integrates seamlessly with any Scheme
interpreter.

TextureOps is a set of plug-ins for the GIMP related to texture. Compositing a feathered layer on top of another layer slightly reduces the contrast in the the feathered region, noticably modifying the texture. TextureOps contains a "Sharpen Feathering" plug-in to counteract this effect. Also in TextureOps is a modified version of the standard "Make Seamless" plug-in that produces a more uniform result, based on similar principals. Finally, TextureOps provides a simple script for synthesizing a tilable texture of arbitrary size from a sample using the Sharpen Feathering plug-in.