Coq au Vin is a blogging engine written in Chicken Scheme. It is designed to appeal to users who have basic Web development skills (i.e., who know HTML and CSS), are able to install their own server-side software, and would rather edit a template than press 105 buttons to customize their sites.
GNU TeXmacs is a free wysiwyw (what you see is what you want) editing platform with special features for scientists. The software aims to provide a unified and user friendly framework for editing structured documents with different types of content: text, mathematics, graphics, interactive content. TeXmacs can also be used as an interface to many external systems for computer algebra, numerical analysis, and statistics. New presentation styles can be written by the user and new features can be added to the editor using Scheme.
SCSS is an R6RS Scheme library for parsing, querying, and emitting style information compatible with the W3C Cascading Stylesheets recommendation. While SCSS does not itself provide any rendering functionality, it can provide style information to applications and libraries that do. SCSS includes a pluggable API for arbitrary document implementations that allows it to accomodate the full range of selector types described in the W3C recommendation; SDOM is supported out-of-the-box.
GnuCash allows you to track bank accounts, stocks, income, and expenses. As quick and intuitive to use as a checkbook register, it is based on professional accounting principles to ensure balanced books and accurate reports. It is backed by an active development community and is blossoming into a full-fledged accounting system.
Kahua is a continuation passing style (CPS) application framework and server. It is written using the Gauche implementation of Scheme. It has the advantage that you can use "continuations" easily, so you can solve the typical Web application's problem of process disconnection. It allows you to program declaratively by using S-expressions as a fundamental data type, you can use Kahua's Object Database to persist data, and you can modify the function being run, supporting incremental development.
Eleven is a programming language for creating robust, scalable Web applications quickly and easily. It offers a 20x programmer productivity increase over traditional server programming languages like ASP, PHP, and JSP by automating state management and taking control of the application's look and feel. From high-level source code with a simple, C-like syntax, the compiler generates complete, ready-to-run implementations in PHP or mod_perl. Applications maintain their state in a relational database and are inherently fault-tolerant, secure, and scalable.
Skribe is a text processor. It is a general purpose tool, but it best suits the writing of technical documents such as Web pages or technical reports, API documentation, etc. At first glance, it looks like a markup language such as 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.). It is the successor of Scheme Scribe.