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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.
Ruby
[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.
MinGW - Minimalist GNU for Windows
[175 users on Ohloh]
MinGW: import libraries and header files for use with GCC to build native Windows applications; now with added extensions to the MSVC runtime to support C99 functionality.
GHC
[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...

Lua
[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.

SCons - a Software Construction tool
[92 users on Ohloh]
SCons is a software construction tool (build tool substitute for Make) implemented in Python. It features a modular build engine that can be embedded in other software. SCons configuration files are Python scripts that call the build engine API. It can scan files to detect dependencies automatically and maintain a global view of all dependencies in a build tree, and uses MD5 signatures to detect changed file contents reliably. Timestamps can be used if you prefer. SCons also supports parallel bu...
Flex
[67 users on Ohloh]
Flex a tool for generating text scanners in C. The input file read by Flex specifies a set of rules (code to be executed when a pattern is found) which describe the scanner to be generated. The output of Flex is a C source file which can be compiled and linked with your sources, giving to your executable the scanning capabilities tailored to your needs.

Generally, Flex is used in combination with a parser generator, like Bison.

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.
Code::Blocks
[63 users on Ohloh]
Code::Blocks is a free, open source, and cross platform IDE. It is being developed in C++ using wxWidgets. Using a plugin architecture, its capabilities and features are defined by the provided plugins.

Code::Blocks is being developed under Windows and Linux. Users have successfully built Code::Blocks under FreeBSD and under Mac OS X.

JRuby
[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.

Parrot
[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.
Scala
[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.)
ANTLR
[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.
The LLVM Compiler Infrastructure
[36 users on Ohloh]
LLVM is a robust system, particularly well suited for developing new mid-level language-independent analyses and optimizations of all sorts, including those that require extensive interprocedural analysis. LLVM is also a great target for front-end development for conventional or research programming languages, including those which require compile-time, link-time, or run-time optimization for effective implementation, proper tail calls or garbage collection. We have an incomplete list of project...
Jython
[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.
Free Pascal Compiler
[34 users on Ohloh]
Tags: pascal compiler development fpc developer
See http://www.ohloh.com/projects/3311. This is only the compiler source, to avoid skewing the stats because of imported header conversions.
OCaml
[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...