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GCC, the GNU Compiler Collection
[2157 users on Ohloh]
The GNU Compiler Collection includes front ends for C, C++, Objective-C, Fortran, Java, and Ada, as well as libraries for these languages (libstdc++, libgcj,...).
Python programming language
[1662 users on Ohloh]
Python is a dynamic, object-oriented programming language that can be used for many kinds of software development. It offers strong support for integration with other languages and tools, comes with extensive standard libraries, and can be learned in a few days. Many Python programmers report substantial productivity gains and feel the language encourages the development of better code.
[665 users on Ohloh]
Ruby is the interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks (as in Perl). It is simple, straight-forward, extensible, and portable.
[122 users on Ohloh]
Haskell is an advanced purely functional programming language. The product of more than twenty years of cutting edge research, it allows rapid development of robust, concise, correct software. With strong support for integration with other languages, built-in concurrency, debuggers, profilers, rich libraries and an active community, Haskell makes it easier to produce flexible, maintainable high-quality software.

GHC is a state-of-the-art, open source, compiler and interac...

[94 users on Ohloh]
Lua is a powerful, fast, light-weight, embeddable scripting language.

Lua combines simple procedural syntax with powerful data description constructs based on associative arrays and extensible semantics. Lua is dynamically typed, runs by interpreting bytecode for a register-based virtual machine, and has automatic memory management with incremental garbage collection, making it ideal for configuration, scripting, and rapid prototyping.

Steel Bank Common Lisp
[65 users on Ohloh]
Steel Bank Common Lisp, aka SBCL, is an open source compiler and runtime system for ANSI Common Lisp. It provides an interactive environment including an integrated native compiler, a debugger, and many extensions.
[53 users on Ohloh]
JRuby is an 100% pure-Java implementation of the Ruby programming language.

JRuby is the effort to recreate the Ruby interpreter in Java. JRuby is tightly integrated with Java to allow both to script any Java class and to embed the interpreter into any Java application.

[45 users on Ohloh]
Parrot is a virtual machine designed to efficiently compile and execute bytecode for dynamic languages. Parrot currently hosts a variety of language implementations in various stages of completion, including Tcl, Javascript, Ruby, Lua, Scheme, PHP, Python, Perl 6, APL, and a .NET bytecode translator. Parrot is not about parrots, though we are rather fond of them for obvious reasons.
[44 users on Ohloh]
Scala is a general purpose programming language designed to express common programming patterns in a concise, elegant, and type-safe way. It smoothly integrates features of object-oriented and functional languages. It is also fully interoperable with Java.
Boo Programming Language
[41 users on Ohloh]
A wrist-friendly language targeting the Common Language Runtime (.NET / Mono) with an extensible compiler pipeline, a syntax reminiscent of Python, and many other features (like type inference, syntactic macros, etc.)
[38 users on Ohloh]
ANother Tool for Language Recognition (ANTLR) is the name of a parser generator that uses LL(k) parsing. ANTLR is the successor to the Purdue Compiler Construction Tool Set (PCCTS), first developed in 1989, and is under active development. Its maintainer is professor Terence Parr of the University of San Francisco.
[35 users on Ohloh]
Jython is a Java implementation of the Python programming language. It allows users to compile Python source code to Java byte codes, and run the resulting bytecodes on any Java Virtual Machine. It is a very seamless and smooth integration with Java: from Python you have complete access to all Java libraries, can build applets, can integrate with Java beans, and can subclass Java classes in Python and vice versa. Like Python, and unlike Java, Jython can also be used interactively: just type some...
CLISP - an ANSI Common Lisp
[34 users on Ohloh]
GNU CLISP is an ANSI Common Lisp implementation with an interpreter, compiler, debugger, object system (CLOS, MOP), sockets, fast bignums, arbitrary precision floats, and foreign language interface which runs on most UNIXes and Win32.
[30 users on Ohloh]
Caml is a general-purpose programming language, designed with program safety and reliability in mind. It is very expressive, yet easy to learn and use. Caml supports functional, imperative, and object-oriented programming styles. It has been developed and distributed by INRIA, France's national research institute for computer science, since 1985.

The Objective Caml system is the main implementation of the Caml language. It features a powerful module system and a full-fledged object-oriente...

[24 users on Ohloh]
Rubinius is an execution environment for the Ruby programming language. It is comprised of three major pieces: a compiler, a 'kernel' (otherwise known as the Ruby Core Library), and a virtual machine. The project's goal is to create a top-of-the-line Ruby implementation.
[22 users on Ohloh]
Tags: programming compiler vala language
Vala is a new programming language that aims to bring modern programming language features to GNOME developers without imposing any additional runtime requirements and without using a different ABI compared to applications and libraries written in C.
[22 users on Ohloh]
EiffelStudio is an IDE for the Eiffel language (ECMA-367, ISO/IEC 25436, and ACM Software System Award 2006).

It includes:
* Eiffel compiler
* Eiffel GUI editor
* Eiffel code browsing tool
* Eiffel diagram editor with round-trip,
* Eiffel refactoring tool
* Eiffel debugger
* Eiffel profiler
* Eiffel analysis tools (Metrics, Dependencies, etc.).

Eiffel generates C or CLI fo...

GDC — D Programming Language for GCC
[21 users on Ohloh]
GDC is a D language front end for the GNU Compiler Collection. It supports a number of targets and nearly all features of Digital Mars D.
[21 users on Ohloh]
Java Compiler Compiler is the most popular parser generator for use with Java applications. A parser generator is a tool that reads a grammar specification and converts it to a Java program that can recognize matches to the grammar. In addition to the parser generator itself, JavaCC provides other standard capabilities related to parser generation such as tree building (via a tool called JJTree included with JavaCC), actions, debugging, etc.
[19 users on Ohloh]
haXe is a high-level object-oriented programming language mainly focused on helping programers develop Websites and Web applications. haXe has been designed to be easily portable across several platforms.