Open Source Haskell Interpreters

Programming language based off pure type systems, and COQ. Currently aimed at both systems, and application programming. Has a simple syntax, and (planned) C integration.

An R5RS Scheme interpreter and library written in Haskell. Provides advanced features including continuations, hygienic macros, and the full numeric tower.

Proof Logic is a functional and equational logical framework for theorem proving based on Combinatory Logic and Lambda Calculus, whose expressions are both terms and proofs proving the equality between two terms.

An interpreter for the Argh! esoteric programming language in wxHaskell. The program allows one to load, edit, save, validate and run Argh! programs. It currently supports all commands except 'e' and 'E'. Documented using Haddock.

A programming language designed for searching and manipulating tree-structured data, particularly corpora of natural languages encoded in an s-expression-like format.

Eve is intended to be a Haskell-derived language with more familiar (Python/Rubyish) syntax. Short term, think of it as a gateway drug to Haskell for Python/Ruby programmers. Long-term, it's intended to be a practical (DB/webapp/GUI-enabled) Haskell.

Here we have fun developing software related to embedded extension languages and small languages in many application domains, using existing languages and/or creating new ones.

Functional Networked Integrated Environment (FUNNIE) is a networked CSCW programming environment specifically tuned to the needs of students and instructors, based on a subset of Haskell.

HScheme is a Scheme interpreter written in Haskell, available as both interactive interpreter and extension library for other Haskell projects. Think 'Guile for Haskell'.

We extend the Eclipse IDE with tools for development in Haskell, a functional programming language, providing support for a wide range of tools (compilers, interpreters, doc tools etc.) in a coherent, convenient and configurable environment.

HSPL is Human Speakable Programming Language, allowing for communication between human-to-computer and human-to-human in the same language. This project has moved to http://sourceforge.net/p/spel We are currently working on human-to-computer programming-language with mostly English base vocabulary. Though once we have that, we plan to add support for other world Languages, including Chinese, Spanish, Russian, Arabic, Hindi, among others. Eventually HSPL shall be the foundation of GIOS the General Intelligence Operating System. Which is an open source operating system, that can be used for intelligent robots, computers and technological host-bodies. Regularly post on blog about HSPL at http://weyounet.info/?s=hspl

JHaskell provides a Haskell interpreter and compiler for the JVM. The goal is to make Haskell a viable language for development for the Java platform and also to allow existing Haskell programs to run on the JVM.

Language Prototyping System

Lsl Plus is an edit/compile/test environment for the Linden Scripting Language (LSL), implemented as an Eclipse plug-in.

A fexpr (unevaluating expression) based Lisp dialect.

Xcerpt is a Query and Transformation Language for XML and Semistructured data. Instead of the navigational approach of XPath-based languages like XSLT or XQuery, Xcerpt uses patterns for querying and is based on concepts of logic programming like unifica