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Jython is an implementation of the high-level, dynamic, object-oriented language Python seamlessly integrated with the Java platform. The predecessor to Jython, JPython, is certified as 100% Pure Java. Jython is freely available for both commercial and non-commercial use and is distributed with source code.

Malbolge is an esoteric language, named after the eighth circle of hell in the Divina Commedia by Dante. Two years were necessary to see the first software produced in this language.

Kawa is a full Scheme implementation written in Java. With Kawa you can access Java objects, methods, fields and classes within your Scheme code. Scheme functions and files are compiled into optimized Java byte-code, allowing you to write Java applications, applets, classes, and servlets in Scheme.

GNU COBOL, formerly known as Open-COBOL, is an open-source COBOL compiler, which translates COBOL programs to C code and compiles it using GCC.

Harbour is a compiler for the xBase superset language often referred to as Clipper (the language that is implemented by the CA-Clipper compiler).

LFE, Lisp Flavoured Erlang, is a lisp syntax front-end to the Erlang compiler. Code produced with it is compatible with "normal" Erlang code. An LFE evaluator and shell is also included.

The libjit library implements Just-In-Time compilation functionality. Unlike other JIT's, this one is designed to be independent of any particular virtual machine bytecode format or language. The hope is that Free Software projects can get a leg-up on proprietry VM vendors by using this library rather than spending large amounts of time writing their own JIT from scratch. This JIT is also designed to be portable to multiple archictures. If you run libjit on a machine for which a native code generator is not yet available, then libjit will fall back to interpreting the code. This way, you don't need to write your own interpreter for your bytecode format if you don't want to.

Replacement for the GNU Objective-C runtime supporting the features of modern dialects of Objective-C for use with GNUstep and other Objective-C programs. This runtime is based on the Etoile Objective-C Runtime, an earlier research prototype, and includes support for non-fragile instance variables, type-dependent dispatch, and object planes. It is fully compatible with the FSF's GCC Objective-C ABI and also implements a new ABI that is supported by Clang and is required for some of the newer features.

Librep is a Lisp system for UNIX, needed by Sawfish window manager. It contains a Lisp interpreter, byte-code compiler and virtual machine. Applications may use the Lisp interpreter as an extension language, or it may be used for stand-alone scripts. The Lisp dialect was originally inspired by Emacs Lisp, but with the worst features removed. It also borrows many ideas from Scheme.

Haskell-mode is a major Emacs mode for editing Haskell source code. It provides syntax highlighting and automatic indentation and comes with inf-haskell which allows interaction with an inferior Haskell interactive loop such as the one of Hugs or GHCi. Note that if you want to use haskell-mode under XEmacs, you should install editors/xemacs-packages instead.