Scheme environment, written in Java, compiles Scheme code to Java bytecode. [Open Source, modified GPL]

Extensible Java-based interpreter for Scheme. The entire R5RS Scheme standard is supported, including a full numeric tower as well as full support for first-class continuations. [Open Source, GPL]

Extensible, Java-based interpreter of full implementation of Scheme R5RS standard; uses modern interpretation methods, outperforms extant JVM interpreters, often by over 10 times. [Open Source MPL, GPL]

Scheme interpreter designed to provide smooth, interactive access to all facilities of the Java environment for rapid prototyping. [Freeware]

An (almost full) R4RS implementation of Scheme in Java, with a seamless and easy to use integration with Java through the Javadot notation. [Open Source]

A nearly R4RS-compliant Scheme implementation written in Java and Scheme, which is multi-user, multi-threaded, and aimed to run on webservers (as servlets). Based on a previous Scheme-in-Java implementation, Jaja, by the same author.