Programming languages for JavaScript

This is a collection of programming language implementations written in JavaScript. Having an interpreter for some language in JavaScript makes it executable in basically any Web-Browser. This is interesting at least for educational purposes. The list is updated whenever I run across something new or whenever you drop me a comment with a hint on a new implementation.
Robert Tolksdorf, Networked Information Systems, FU Berlin, is-research.
(Programming languages for the Java Virtual Machine is a list of programming languages for the Java virtual machine aside of Java itself)