An implementation of the language described in "Karel the Robot: A Gentle Introduction to The Art of Programming" by Richard Pattis et al. Both Java and C/Unix versions are available.
R7RS Scheme scripting engine
Gauche is an R7RS Scheme implementation aimed to be a handy tool for daily works. Quick startup, built-in system interface and native multilingual support are some of the goals.
A tiny Scheme interpreter for embedding in programs.
TinyScheme is a Scheme interpreter that can execute Scheme code but is also suitable for embedding in programs. The goal is to keep the interpreter small while providing as much compatability with Scheme standards as possible.
A Unix shell embedded in Scheme.
Ksi is a portable, embeddable Scheme implementation written in C.
MOSREF provides a secure, portable and dynamic environment for the development, deployment and management of network and host security auditing tools.
This is a resurrection of Matthias Blume's VSCM Scheme implementation.
SketchyLISP is a highly portable, embeddable interpreter for purely applicative Scheme.
Bytecode-based Scheme (R^5RS) implementation. Fast, compact, stable, suitable for education and experimentation.
FramerD is a distributed semi-structured object database originally developed at MIT. It provides an internationalized Scheme-based scripting language, built-in text analysis tools, and special support for web scripting.
The MDK provides a simulator of D. Knuth's MIX computer, and a development environment to write, run and debug MIXAL programs on it.
Genjutsu is a programming language designed for extending C/C++ applications. The syntax is akin to Scheme's. Genjutsu is optimized for distributed object systems and designed to make such applications easy to write. Included is a shell, gjsh.
A simple interface to SQL databases (currently MySQL and PostgreSQL) from Guile.
A data manipulation and programming system based on POStiche (protean) objects. It provides the foundation for the Adage project.
PLT Spy is a Python to Scheme translator.
A collection of tools for the SETL Programming Language, including a LALR parser generator and lexical scanner generator.
STklos is an efficient Scheme System providing a powerful Object System
Scheme Module for Apache 2.0 and later.
Water: a fast, secure, dynamic OO language and database. Water is an all-purpose language (and meta-language) that runs Web applications in the browser or server-side. Water is compatible with .NET, Java, and C on Windows, Linux and Mac OS X system.
Wisp is a small Scheme-like language designed to be easily used in various structured data processing tools. The accent is on simplicity, automatical generatibility, and efficiency. (Currently on long hiatus. Gauche has similar goals and is maturer.)
XSieve is an XML transformation language based on combination of XSLT (an XML transformation language) and Scheme (a Lisp dialect). XSieve is a powerful tool for complex data transformation tasks.
sexpreader is a library which can be used by compiler or interpreter writers who want to read LISP-like constructs. This library can read in various tokens like integers, floats, symbols, strings, characters, booleans and parenthesis.