Factor is a dynamically-typed stack-based programming language. Factor runs on various OSes and CPU architectures, and provides an optimizing compiler, interactive development environment, powerful collections, higher order programming, continuations, and a growing library of contributed code.
RScheme is an object-oriented, extended Scheme implementation with a compiler that targets C or (RScheme's own) bytecodes. It has features expected from a modern language: an object system, reflection, modules, namespaces, safe macros, threads, a system call interface (including sockets), separate compilation, and persistence, as well as the formal basis and power of the Scheme programming language. RScheme also features a powerful, elegant foreign code interface.
Stratego/XT is a development environment for creating stand-alone transformation systems. It combines Stratego, a language for implementing transformations based on the paradigm of programmable rewriting strategies, with XT, a collection of reusable components and tools for the development of transformation systems. In general, Stratego/XT is intended for the analysis, manipulation, and generation of programs, though its features make it useful for transforming any structured documents. In practice, it has been used to build many types of transformation systems including compilers, interpreters, static analyzers, domain-specific optimizers, code generators, source code refactorers, documentation generators, and document transformers.